Re: logistic regression question

On Feb 1, 11:03 am, amorphia <spam.onto...@xxxxxxxxx> wrote:
Hi all,

I have an experimental design where subjects make a sequence of simple
binary choices A or B. I would like to test the hypothesis that
initially in the sequence subjects tend to choose A, but this bias
degrades to random (or perhaps a bias to B) as the sequence
progresses.

Initially I thought that maybe I could do a simple binary logistic
regression, with sequence position as the only covariate. But now I
think that this is probably invalid, because this would assume that
choices at sequence position t+1 are independent of choices at
sequence t. This assumption is plainly false because the choices are
made by the same individuals who may make runs of the same choice.

Can I solve this problem by including individual as a factor in the
model perhaps? Or is a more complicated solution necessary?

Thanks!

Ben

You are looking at the choices as the sequence progresses. In binary
logistic, you are actually specifying one choice in the sequence
(perhaps the last) as your outcome. Is that what you want? It
seems that you want to see the influence of early choices on several
later choices.

Marc
.

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