Re: [R] Proportion test in three-chices experiment

From: Rafael Laboissiere <>
Date: Mon 18 Jul 2005 - 06:56:41 EST

Jon and Spencer,

First of all, thanks for your insightful comments on my questions. I am quite impressed by the level of support one finds in the r-help mailing list. In particular, as Spencer pointed out in another post, I did not do my homework and you have been overly kind in discussing the issue. I promised Spencer privately that I will read the Posting Guide before getting farther in the thread, but I would like just to give a short answer:

> You still aren't saying whether you are doing this for each subject for
> the entire data set summed over subjects. If the latter, are you
> worried about subject variance? Do you think it possible that some
> subjects might show better performance in condition 2? Would you be
> happy if you tested a single subject and got the result? If subject
> variance is an issue, then you need to test "across subjects." One way
> to do that is to compute some performance measure for each subject and
> each condition and then do a matched-pairs t test across subjects.

Yes, I intend to do the test across subjects and subject variance is indeed an issue in my case.

Thanks for your further suggestions, I will look at them carefully.


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Received on Mon Jul 18 07:01:40 2005

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