Timeline for Do we need a pre-test to compare the effectiveness of two treatments?
Current License: CC BY-SA 3.0
13 events
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| Jun 2, 2014 at 7:37 | comment | added | Nick Stauner | This would've been a good one for Cross Validated too (if possibly a duplicate, though I can't find one to recommend). Too many questions ask what to do with data they've already collected; not enough are about research design. Jeromy's answer is great though; I might even refer people on CV to it. :) | |
| Jun 27, 2013 at 9:26 | comment | added | Gala | Well, that's why it was merely a comment. I just thought it was funny you should be so confident when it was obvious to me that this would generate strong psychologically-relevant correlations. Paying attention to this kind of things is infinitely more important than statistical niceties or including a pre-test measure. Regarding the question itself, I think Jeromy already covered it quite well. You might also want to check stats.stackexchange.com/questions/3466/… which provides a lot of references on the issues involved. | |
| Jun 27, 2013 at 9:22 | comment | added | user3116 | @GaëlLaurans Yes, okay, I edited my example. Simply assume that assignation is random. The focus of my question is elsewhere. | |
| Jun 27, 2013 at 9:21 | history | edited | user3116 | CC BY-SA 3.0 |
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| Jun 25, 2013 at 6:51 | vote | accept | CommunityBot | moved from User.Id=3116 by developer User.Id=130 | |
| Jun 24, 2013 at 11:38 | comment | added | Gala | In your example, class assignment is definitely not random at all. First letter of last name depends on language and hence ethnicity/origin and many other relevant socio-economic variables in many societies. This one was easy to debunk and could lead to some large correlations but generally speaking this sort of procedures are not a good way to randomize at all. | |
| Jun 14, 2013 at 19:59 | history | tweeted | twitter.com/#!/StackCogSci/status/345631497744678912 | ||
| Jun 12, 2013 at 11:51 | comment | added | user3116 | I changed my example to a case where we don't have the values pre-treatment. | |
| Jun 12, 2013 at 11:50 | history | edited | user3116 | CC BY-SA 3.0 |
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| Jun 12, 2013 at 11:18 | comment | added | Ana | But you did measure depressivity: you know that your subjects have light depression. | |
| Jun 11, 2013 at 11:43 | history | edited | Jeromy Anglim |
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| Jun 11, 2013 at 11:40 | answer | added | Jeromy Anglim | timeline score: 9 | |
| Jun 11, 2013 at 9:51 | history | asked | user3116 | CC BY-SA 3.0 |