[R] Proportion test in three-chices experiment

From: Rafael Laboissiere <laboissiere_at_cbs.mpg.de>
Date: Thu 14 Jul 2005 - 08:44:44 EST


Hi,

I wish to analyze with R the results of a perception experiment in which subjects had to recognize each stimulus among three choices (this was a forced-choice design). The experiment runs under two different conditions and the data is like the following:

   N1 : count of trials in condition 1
   p11, p12, p13: proportions of choices 1, 2, and 3 in condition 1    

   N2 : count of trials in condition 2
   p21, p22, p23: proportions of choices 1, 2, and 3 in condition 2    

How can I test whether the triple (p11,p12,p13) is different from the triple (p21,p22,p23)? Clearly, prop.test does not help me here, because it relates to two-choices tests.

I apologize if the answer is trivial, but I am relatively new to R and could not find any pointers in the FAQ or in the mailing list archives.

Thanks in advance for any help,

-- 
Rafael Laboissiere

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Received on Thu Jul 14 08:48:58 2005

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