Random Assignment in Psychology: Definition & Examples
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In psychology, random assignment refers to the practice of allocating participants to different experimental groups in a study in a completely unbiased way, ensuring each participant has an equal chance of being assigned to any group.
In experimental research, random assignment, or random placement, organizes participants from your sample into different groups using randomization.
Random assignment uses chance procedures to ensure that each participant has an equal opportunity of being assigned to either a control or experimental group.
The control group does not receive the treatment in question, whereas the experimental group does receive the treatment.
When using random assignment, neither the researcher nor the participant can choose the group to which the participant is assigned. This ensures that any differences between and within the groups are not systematic at the onset of the study.
In a study to test the success of a weight-loss program, investigators randomly assigned a pool of participants to one of two groups.
Group A participants participated in the weight-loss program for 10 weeks and took a class where they learned about the benefits of healthy eating and exercise.
Group B participants read a 200-page book that explains the benefits of weight loss. The investigator randomly assigned participants to one of the two groups.
The researchers found that those who participated in the program and took the class were more likely to lose weight than those in the other group that received only the book.
Importance
Random assignment ensures that each group in the experiment is identical before applying the independent variable.
In experiments , researchers will manipulate an independent variable to assess its effect on a dependent variable, while controlling for other variables. Random assignment increases the likelihood that the treatment groups are the same at the onset of a study.
Thus, any changes that result from the independent variable can be assumed to be a result of the treatment of interest. This is particularly important for eliminating sources of bias and strengthening the internal validity of an experiment.
Random assignment is the best method for inferring a causal relationship between a treatment and an outcome.
Random Selection vs. Random Assignment
Random selection (also called probability sampling or random sampling) is a way of randomly selecting members of a population to be included in your study.
On the other hand, random assignment is a way of sorting the sample participants into control and treatment groups.
Random selection ensures that everyone in the population has an equal chance of being selected for the study. Once the pool of participants has been chosen, experimenters use random assignment to assign participants into groups.
Random assignment is only used in between-subjects experimental designs, while random selection can be used in a variety of study designs.
Random Assignment vs Random Sampling
Random sampling refers to selecting participants from a population so that each individual has an equal chance of being chosen. This method enhances the representativeness of the sample.
Random assignment, on the other hand, is used in experimental designs once participants are selected. It involves allocating these participants to different experimental groups or conditions randomly.
This helps ensure that any differences in results across groups are due to manipulating the independent variable, not preexisting differences among participants.
When to Use Random Assignment
Random assignment is used in experiments with a between-groups or independent measures design.
In these research designs, researchers will manipulate an independent variable to assess its effect on a dependent variable, while controlling for other variables.
There is usually a control group and one or more experimental groups. Random assignment helps ensure that the groups are comparable at the onset of the study.
How to Use Random Assignment
There are a variety of ways to assign participants into study groups randomly. Here are a handful of popular methods:
- Random Number Generator : Give each member of the sample a unique number; use a computer program to randomly generate a number from the list for each group.
- Lottery : Give each member of the sample a unique number. Place all numbers in a hat or bucket and draw numbers at random for each group.
- Flipping a Coin : Flip a coin for each participant to decide if they will be in the control group or experimental group (this method can only be used when you have just two groups)
- Roll a Die : For each number on the list, roll a dice to decide which of the groups they will be in. For example, assume that rolling 1, 2, or 3 places them in a control group and rolling 3, 4, 5 lands them in an experimental group.
When is Random Assignment not used?
- When it is not ethically permissible: Randomization is only ethical if the researcher has no evidence that one treatment is superior to the other or that one treatment might have harmful side effects.
- When answering non-causal questions : If the researcher is just interested in predicting the probability of an event, the causal relationship between the variables is not important and observational designs would be more suitable than random assignment.
- When studying the effect of variables that cannot be manipulated: Some risk factors cannot be manipulated and so it would not make any sense to study them in a randomized trial. For example, we cannot randomly assign participants into categories based on age, gender, or genetic factors.
Drawbacks of Random Assignment
While randomization assures an unbiased assignment of participants to groups, it does not guarantee the equality of these groups. There could still be extraneous variables that differ between groups or group differences that arise from chance. Additionally, there is still an element of luck with random assignments.
Thus, researchers can not produce perfectly equal groups for each specific study. Differences between the treatment group and control group might still exist, and the results of a randomized trial may sometimes be wrong, but this is absolutely okay.
Scientific evidence is a long and continuous process, and the groups will tend to be equal in the long run when data is aggregated in a meta-analysis.
Additionally, external validity (i.e., the extent to which the researcher can use the results of the study to generalize to the larger population) is compromised with random assignment.
Random assignment is challenging to implement outside of controlled laboratory conditions and might not represent what would happen in the real world at the population level.
Random assignment can also be more costly than simple observational studies, where an investigator is just observing events without intervening with the population.
Randomization also can be time-consuming and challenging, especially when participants refuse to receive the assigned treatment or do not adhere to recommendations.
What is the difference between random sampling and random assignment?
Random sampling refers to randomly selecting a sample of participants from a population. Random assignment refers to randomly assigning participants to treatment groups from the selected sample.
Does random assignment increase internal validity?
Yes, random assignment ensures that there are no systematic differences between the participants in each group, enhancing the study’s internal validity .
Does random assignment reduce sampling error?
Yes, with random assignment, participants have an equal chance of being assigned to either a control group or an experimental group, resulting in a sample that is, in theory, representative of the population.
Random assignment does not completely eliminate sampling error because a sample only approximates the population from which it is drawn. However, random sampling is a way to minimize sampling errors.
When is random assignment not possible?
Random assignment is not possible when the experimenters cannot control the treatment or independent variable.
For example, if you want to compare how men and women perform on a test, you cannot randomly assign subjects to these groups.
Participants are not randomly assigned to different groups in this study, but instead assigned based on their characteristics.
Does random assignment eliminate confounding variables?
Yes, random assignment eliminates the influence of any confounding variables on the treatment because it distributes them at random among the study groups. Randomization invalidates any relationship between a confounding variable and the treatment.
Why is random assignment of participants to treatment conditions in an experiment used?
Random assignment is used to ensure that all groups are comparable at the start of a study. This allows researchers to conclude that the outcomes of the study can be attributed to the intervention at hand and to rule out alternative explanations for study results.
Further Reading
- Bogomolnaia, A., & Moulin, H. (2001). A new solution to the random assignment problem . Journal of Economic theory , 100 (2), 295-328.
- Krause, M. S., & Howard, K. I. (2003). What random assignment does and does not do . Journal of Clinical Psychology , 59 (7), 751-766.
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Methodology
- Random Assignment in Experiments | Introduction & Examples
Random Assignment in Experiments | Introduction & Examples
Published on March 8, 2021 by Pritha Bhandari . Revised on June 22, 2023.
In experimental research, random assignment is a way of placing participants from your sample into different treatment groups using randomization.
With simple random assignment, every member of the sample has a known or equal chance of being placed in a control group or an experimental group. Studies that use simple random assignment are also called completely randomized designs .
Random assignment is a key part of experimental design . It helps you ensure that all groups are comparable at the start of a study: any differences between them are due to random factors, not research biases like sampling bias or selection bias .
Table of contents
Why does random assignment matter, random sampling vs random assignment, how do you use random assignment, when is random assignment not used, other interesting articles, frequently asked questions about random assignment.
Random assignment is an important part of control in experimental research, because it helps strengthen the internal validity of an experiment and avoid biases.
In experiments, researchers manipulate an independent variable to assess its effect on a dependent variable, while controlling for other variables. To do so, they often use different levels of an independent variable for different groups of participants.
This is called a between-groups or independent measures design.
You use three groups of participants that are each given a different level of the independent variable:
- a control group that’s given a placebo (no dosage, to control for a placebo effect ),
- an experimental group that’s given a low dosage,
- a second experimental group that’s given a high dosage.
Random assignment to helps you make sure that the treatment groups don’t differ in systematic ways at the start of the experiment, as this can seriously affect (and even invalidate) your work.
If you don’t use random assignment, you may not be able to rule out alternative explanations for your results.
- participants recruited from cafes are placed in the control group ,
- participants recruited from local community centers are placed in the low dosage experimental group,
- participants recruited from gyms are placed in the high dosage group.
With this type of assignment, it’s hard to tell whether the participant characteristics are the same across all groups at the start of the study. Gym-users may tend to engage in more healthy behaviors than people who frequent cafes or community centers, and this would introduce a healthy user bias in your study.
Although random assignment helps even out baseline differences between groups, it doesn’t always make them completely equivalent. There may still be extraneous variables that differ between groups, and there will always be some group differences that arise from chance.
Most of the time, the random variation between groups is low, and, therefore, it’s acceptable for further analysis. This is especially true when you have a large sample. In general, you should always use random assignment in experiments when it is ethically possible and makes sense for your study topic.
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Random sampling and random assignment are both important concepts in research, but it’s important to understand the difference between them.
Random sampling (also called probability sampling or random selection) is a way of selecting members of a population to be included in your study. In contrast, random assignment is a way of sorting the sample participants into control and experimental groups.
While random sampling is used in many types of studies, random assignment is only used in between-subjects experimental designs.
Some studies use both random sampling and random assignment, while others use only one or the other.
Random sampling enhances the external validity or generalizability of your results, because it helps ensure that your sample is unbiased and representative of the whole population. This allows you to make stronger statistical inferences .
You use a simple random sample to collect data. Because you have access to the whole population (all employees), you can assign all 8000 employees a number and use a random number generator to select 300 employees. These 300 employees are your full sample.
Random assignment enhances the internal validity of the study, because it ensures that there are no systematic differences between the participants in each group. This helps you conclude that the outcomes can be attributed to the independent variable .
- a control group that receives no intervention.
- an experimental group that has a remote team-building intervention every week for a month.
You use random assignment to place participants into the control or experimental group. To do so, you take your list of participants and assign each participant a number. Again, you use a random number generator to place each participant in one of the two groups.
To use simple random assignment, you start by giving every member of the sample a unique number. Then, you can use computer programs or manual methods to randomly assign each participant to a group.
- Random number generator: Use a computer program to generate random numbers from the list for each group.
- Lottery method: Place all numbers individually in a hat or a bucket, and draw numbers at random for each group.
- Flip a coin: When you only have two groups, for each number on the list, flip a coin to decide if they’ll be in the control or the experimental group.
- Use a dice: When you have three groups, for each number on the list, roll a dice to decide which of the groups they will be in. For example, assume that rolling 1 or 2 lands them in a control group; 3 or 4 in an experimental group; and 5 or 6 in a second control or experimental group.
This type of random assignment is the most powerful method of placing participants in conditions, because each individual has an equal chance of being placed in any one of your treatment groups.
Random assignment in block designs
In more complicated experimental designs, random assignment is only used after participants are grouped into blocks based on some characteristic (e.g., test score or demographic variable). These groupings mean that you need a larger sample to achieve high statistical power .
For example, a randomized block design involves placing participants into blocks based on a shared characteristic (e.g., college students versus graduates), and then using random assignment within each block to assign participants to every treatment condition. This helps you assess whether the characteristic affects the outcomes of your treatment.
In an experimental matched design , you use blocking and then match up individual participants from each block based on specific characteristics. Within each matched pair or group, you randomly assign each participant to one of the conditions in the experiment and compare their outcomes.
Sometimes, it’s not relevant or ethical to use simple random assignment, so groups are assigned in a different way.
When comparing different groups
Sometimes, differences between participants are the main focus of a study, for example, when comparing men and women or people with and without health conditions. Participants are not randomly assigned to different groups, but instead assigned based on their characteristics.
In this type of study, the characteristic of interest (e.g., gender) is an independent variable, and the groups differ based on the different levels (e.g., men, women, etc.). All participants are tested the same way, and then their group-level outcomes are compared.
When it’s not ethically permissible
When studying unhealthy or dangerous behaviors, it’s not possible to use random assignment. For example, if you’re studying heavy drinkers and social drinkers, it’s unethical to randomly assign participants to one of the two groups and ask them to drink large amounts of alcohol for your experiment.
When you can’t assign participants to groups, you can also conduct a quasi-experimental study . In a quasi-experiment, you study the outcomes of pre-existing groups who receive treatments that you may not have any control over (e.g., heavy drinkers and social drinkers). These groups aren’t randomly assigned, but may be considered comparable when some other variables (e.g., age or socioeconomic status) are controlled for.
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If you want to know more about statistics , methodology , or research bias , make sure to check out some of our other articles with explanations and examples.
- Student’s t -distribution
- Normal distribution
- Null and Alternative Hypotheses
- Chi square tests
- Confidence interval
- Quartiles & Quantiles
- Cluster sampling
- Stratified sampling
- Data cleansing
- Reproducibility vs Replicability
- Peer review
- Prospective cohort study
Research bias
- Implicit bias
- Cognitive bias
- Placebo effect
- Hawthorne effect
- Hindsight bias
- Affect heuristic
- Social desirability bias
In experimental research, random assignment is a way of placing participants from your sample into different groups using randomization. With this method, every member of the sample has a known or equal chance of being placed in a control group or an experimental group.
Random selection, or random sampling , is a way of selecting members of a population for your study’s sample.
In contrast, random assignment is a way of sorting the sample into control and experimental groups.
Random sampling enhances the external validity or generalizability of your results, while random assignment improves the internal validity of your study.
Random assignment is used in experiments with a between-groups or independent measures design. In this research design, there’s usually a control group and one or more experimental groups. Random assignment helps ensure that the groups are comparable.
In general, you should always use random assignment in this type of experimental design when it is ethically possible and makes sense for your study topic.
To implement random assignment , assign a unique number to every member of your study’s sample .
Then, you can use a random number generator or a lottery method to randomly assign each number to a control or experimental group. You can also do so manually, by flipping a coin or rolling a dice to randomly assign participants to groups.
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noun as in responsibility, task
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- appointment
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noun as in selecting or setting apart
- distribution
- apportionment
- appropriation
- assignation
- attribution
- authorization
- consignment
- designation
- determination
- specification
- stipulation
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Words related to assignment are not direct synonyms, but are associated with the word assignment . Browse related words to learn more about word associations.
noun as in matter or business to be taken care of; happening activity
- circumstance
- office function
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noun as in job, position of responsibility
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noun as in arrangement for meeting; prearranged meeting
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noun as in allocation, setting aside
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Yariel Valdés González and I faced these challenges while on assignment in South Florida and the Deep South from July 21-Aug.
They’re putting time into decoration just as they would in their physical classroom, and students can interact with the space by, say, clicking on a bookshelf to get a reading assignment.
For now, if the district moves to in-person learning, instruction in Carlsbad will take place on campus five days per week and students may engage in additional independent practices and other assignments at home.
The assignments must also respect the relationships between the elements in the group.
It’s very hard, by the way, to do real random assignment studies of couples therapy.
His most recent assignment was the 84th Precinct, at the Brooklyn end of the Brooklyn Bridge.
When Lewis was shipped off to Vietnam, his son was just three months old, and the timing of the assignment worried Lewis.
When Vial got that first assignment, she was just beginning her photography career, and Cirque du Soleil was only a few years old.
“For our winter issue, we gave ourselves one assignment: Break The Internet,” wrote Paper.
By the 1950s the rapid assignment of gender to an ambiguously gendered infant had become standard.
Consent to an assignment may be given by the president of the company, without formal vote by the directors.
A transfer by the lessee of the whole or a part of his interest for a part of the time is a sublease and not an assignment.
An assignment to one who has an insurable interest as relative, creditor and the like, is always valid.
When an assignment of it is made, the assignee may sue in his own name for rent accruing after the assignment.
In some states statutes forbid the assignment of such policies for the benefit of creditors.
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On this page you'll find 85 synonyms, antonyms, and words related to assignment, such as: appointment, chore, drill, duty, homework, and job.
From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
Random assignment Synonyms
Definitions for random.
- (adjective) lacking a definite plan, purpose, or pattern
- (adjective) lacking any definite plan or order or purpose; governed by or depending on chance
Synonyms for phrase
- accidental job
- haphazard mission
- arbitrary designation
- casual distribution
- arbitrary mission
- irregular distribution
- accidental transfer
- accidental post
- casual exercise
- odd mission
- odd distribution
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RA abbreviation
Assignment replaced.
- random selection
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- random work
- random errand
Definitions for Assignment
- (noun) a piece of work that needs to be done regularly
- (noun) a specific task with which a person or group is charged
- (noun) something assigned to be read or studied
Synonyms of assignments
- as in tasks
- as in missions
- as in lessons
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- responsibilities
- undertakings
- enterprises
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- requirements
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- appointments
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Antonyms & Near Antonyms
- depositions
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Thesaurus Entries Near assignments
assignments
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“Assignments.” Merriam-Webster.com Thesaurus , Merriam-Webster, https://www.merriam-webster.com/thesaurus/assignments. Accessed 2 Apr. 2024.
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What are some opposite words for Random assignment ?
Antonyms for random assignment ran·dom as·sign·ment, this page is about all possible antonyms and opposite words for the term random assignment ., concise medical dictionary, by joseph c segen, md rate these synonyms: 0.0 / 0 votes.
random assignment
Synonyms: Randomisation, see there
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- appointment responsibility, position
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Random selection (also called probability sampling or random sampling) is a way of randomly selecting members of a population to be included in your study. On the other hand, random assignment is a way of sorting the sample participants into control and treatment groups. Random selection ensures that everyone in the population has an equal ...
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Random Assignment in Experiments | Introduction & Examples. Published on March 8, 2021 by Pritha Bhandari.Revised on June 22, 2023. In experimental research, random assignment is a way of placing participants from your sample into different treatment groups using randomization. With simple random assignment, every member of the sample has a known or equal chance of being placed in a control ...
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the instrument by which a claim or right or interest or property is transferred from one person to another. Synonyms: appointment, assigning, duty assignment, designation, grant, naming. assignment, assigning noun. the act of distributing something to designated places or persons. "the first task is the assignment of an address to each datum".
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