Is it possible that the subjects are getting better over the then trials? That is, that they are learning to make the judgements better? If there responses are random, due to no effect of the treatment, then this won't happen, but if there is a treatment effect, then it may be more pronounced in the later decisions than in the earlier ones. Moreover, the effect over trials are likely to vary among subjects.
While other tests may be suitable, you might compare the first trials and last trials against the null hypothesis. These are relatively weak tests, however, even if exact tests are used.
Regards,
David Smith
David W. Smith, Ph.D., M.P.H.
Associate Professor of Biometry
University of Texas School of Public Health Border Campus
(210)567-3560
[EMAIL PROTECTED]
-----Original Message-----
From: Jan Malte Wiener [mailto:[EMAIL PROTECTED]]
Sent: Thursday, September 26, 2002 8:45 AM
To: [EMAIL PROTECTED]
Subject: signed-rank test and ties
hi,
i am looking for a way to correct for ties in signed-rank tests.
whats the easiest way to do so?
i have heard that W. Buck (1075) made a table that corrects for ties!
Does anyone has this table, or does anyone know where to get it ??
thanks in advance
jan
.
.
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