random assignment

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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.


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 ?
The design uses random assignment to place study participants into either the immediate (Phase I) or delayed (Phase II) intervention conditions and uses multiple posttests.
2 is greater than the expected optimal value of the random assignment problem [[pi].
Other courts have denied that random assignment is a matter of litigable constitutional law.
2005 study) is generally considered to be the next best approach" when random assignment is "not possible"(p.
Subsequent to random assignment, parents were asked for permission to share substance abuse treatment information.
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).
Random assignment refers to the use of a random numbers table or computer program to assign members of the sample, whether randomly selected or not, to experimental or comparison groups.
The UK is preparing to start one of the largest random assignment evaluations of a new social policy that has ever been undertaken in Europe or North America.
Patients started the study with a 4-night placebo run-in followed by random assignment to either 4 nights of placebo or the supplement, a 10-day washout, and then a crossover for 4 nights.
Apparently, even though she fitted the criteria of being over 25 and out of work for more than a year - her national insurance number needed to end in a number lower than six under a policy of random assignment.
In medical drug-comparison studies (perhaps Finn's reference point), random assignment is considered necessary, but not sufficient, for adequate experimental control.

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