random assignment


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assignment

 [ah-sīn´ment]
the selection of something for a specific purpose.
random assignment in a research study, the assignment of subjects to experimental (treatment) or control groups in such a way that each member of a sample has an equal chance of being assigned to a particular group. Random assignment ensures that the groups will be as alike as possible at the beginning of the study. Called also randomization.

random assignment,

n a method of allotting membership in research groups that tends to factor out any confounding variables so that any remaining differences can be attributed to the variable being researched.

random

unplanned, without direction or purpose.

random assignment
random mating
where each member of the population has an equal opportunity of mating with every member of the opposite sex.
random numbers
a list of numbers obtained by a standard randomization procedure; used commonly to select individual animals from a pack.
random sample
see random sample.
random sampling
a procedure for selecting units from a group in such a way that each unit has an equal chance of being selected in the sample.
random selection
selection in such a way as to produce a random sample.
random variable
a group or quantity that takes various values, each with varying probabilities.
References in periodicals archive ?
In this paper, after reviewing problems that have plagued earlier research, we conclude that the "natural experiment" created by the random assignment of cases to judges in many courthouses around the country provides the best opportunity to evaluate the success of the guidelines at reducing disparity.
Using the random assignment of college students to professors in a large body of required coursework, Carrell and West examine how professor quality affects student achievement.
The evaluation, funded by the National Institute of Justice, included random assignment to OPTS or a control group.
The famous Tennessee STAR random assignment study evaluated class size reduction, which also produced about a one-third of a standard deviation improvement in achievement for minority students.
Regarding internal validity, and conditions inherent in the research design that provide alternative explanations for obtained results, Bauman stresses that random assignment and replication give us more faith in being able to generalize the results.
The investigators in the Schizophrenia Research review included studies that had a comparison condition with random assignment by individual or group, or a comparison with matched controls.
failure of random assignment or failing to control for non-random assignment, and/or failure to proctor the examinations.
Random assignment occurs when investigators use a random process like the toss of a coin to decide which participants are assigned to an "experimental" group (which gets the intervention) and which are assigned to a "control" group (which does not).
To evaluate the efficacy of this intervention, the Office of the Research Director of the Illinois Department of Children and Family Services (IDCFS) designed a random assignment field experiment that the department implemented in three evaluation sites across the state.
Sugerman HJ, Londrey CL, Kellum JM, et al: Weight loss with vertical banded gastroplasty and Roux-en-Y gastric bypass for morbid obesity with selective versus random assignment.
Because neither the random assignment of enrollees to managed care (versus FFS) nor the random assignment of Minnesota counties to implement PMAP (versus FFS Medicaid) was possible under this evaluation, we turned to a quasi-experimental evaluation design.
In only three cases did substantial confusion arise, mainly concerning random assignment to different psychotherapy schedules.

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