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Questions tagged [double-blind]

A double blind study is one in which neither the researchers nor the subjects know which treatment or condition is given to which subject.

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In the specific context of baseline traits of study participants (see ref.), what is p value? What's being tested and is it pointless? meaningful?

(Please assume readers already have a basic understanding of what p is in general.) The is it pointless part of this question seems to be YES; that part of the question is similar to, and I'd guess ...
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Design of a triangular test (or 2-out-of-5) when there is intra-group variability of samples

I would like to submit to an expert group a set of images from two genetically different types of plants to see if they can find a difference. I have 20 images for each of the two types. Images are ...
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Can I reuse the dataset set aside for performing t-test based on the following condition?

I have a small number of samples and large number features. For doing the feature selection I'm going to divide my total set into a feature selection set and a test set.I run the t-test on the former ...
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A randomized, double-blind crossover (AB/BA) observational study of new use of an FDA approved drug

I found a new use of a drug already in use. The results are as follows. Serail No. of Patient-- Attacks while on Placebo-- Attacks while on drug --Difference in the no. of attacks 1- 23- 2- ...