Statistical Analysis Stack Exchange
Statistical Analysis Stack Exchange

Questions tagged [random-allocation]

The process of randomly allocating subjects (often in the context of a clinical trial) or other experimental units into two or more conditions.

In clinical trials it is usual to try to avoid selection bias by allocating the participants using a random process which is concealed from the staff making the allocation until they have assessed eligibility. The CONSORT guidleines http://www.consort-statement.org/ for reporting clinical trials have details on how and why.

202 questions
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What is re-randomization?

I'm a statistics newbie, taking an online course, and the term "re-randomization" was thrown in without explanation. What does it mean?
Julian A.
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Prejudice in blind test

There is a blind test that asks participants to distinguish Coke and Pepsi. A participant will test 6 cups of drink and tell whether it was Coke or Pepsi. Assuming that the participant can tell the difference between them, though not perfect, if he…
user67275
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Stratified randomization with permuted-block randomization

I need to create a computer program for randomizing subjects using stratified randomization with permuted-block randomization, so I want to make sure my thinking is correct: Suppose that in an experiment, there are two groups (control and…
SEL
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weighted randomization

I would like to randomize subjects in two groups so that the allocation ratio is 1:1. Let's say the control group already has 5 subjects while the experimental group already has 7 subjects. Then, the next subject will be randomized to the…
user7064
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A question about randomization with unexpected bias

I need your advice in the following dilemma: a physician wishes to conduct a double blind randomized prospective study. The patients are randomly separated in two groups. Each group will be submitted to a particular medical procedure that need…
user132794
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Randomization method that allows for controlling for continous covariates

I have a group of patients (about 100 of them) that needs to be randomized into 2 groups (treatment and control) so that these groups were as similar as possible in terms of some (about 6-10) covariates. Some of covariates are continous. I can't cut…
Łukasz Deryło
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How to do a balance-test in a randomized controlled experiment?

Can someone explain to me how I do a balance test in a randomized controlled experiment? Do I choose the important covariates and estimate whether there is a significant difference between my two treatment groups and my control group regarding the…
Daniel Anderson
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Which test(s) should I use for RCT, 2 groups (intervention vs. comparator) and two DVs measured at multiple points (pre, post, 3, 6, 12 months)?

I am planning an RCT to evaluate the short- and long-term effectiveness of a CBT intervention. There will be two groups: intervention vs. active comparator and two outcome measures: anxiety scale and depression scale. Measures will be assessed…
Emrap
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