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Feb 23, 2009 11:12 AM
(665 views)

So, I would like a formula or procedure to compute the average reaction time for experimental condition 1 for each subject and divide the reaction times for conditions 2-5 by the average for condition 1.

I appreciate any advice you can give me.

4 REPLIES

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Feb 24, 2009 9:32 AM
(588 views)

This is unclear. Is there more than one observation for each subject at each condition? You didn't say that there were more than one observation for each subject at each condition.

It would be relatively easy to set each condition to have a mean of zero, which should also then give you the ability to do the comparison that I think you want to do. It is more complicated and time consuming to match everything to condition 1. Would zero means work for you?

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Feb 24, 2009 12:50 PM
(588 views)

Thanks for your reply.

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Feb 25, 2009 9:11 AM
(588 views)

Here is an outline of the steps

1. Use Tables->Summary to obtain a table of means by subject for condition 1

2. Join this new table back into the original table, by subject

3. Create a new column where you create a formula to do the normalization

To get the same data to have zero means for each subject/condition combination, you would do a Fit Model, where the term in the model is subject*condition. The residuals have zero mean in each subject condition combination.

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Feb 25, 2009 10:26 AM
(588 views)