reliability

I am trying to calculate test retest reliability for psychological
measurement scales. I assume that the intraclass correlation is the
most appropriate measure. But previous studies on similar scales often
seem to employ Pearson's r. Which one do I choose. And, if I choose
the ICC, which model do I choose and do I use absolute agreement or
consistency.

Thanks! I have ordered Norman and Streiner's text on this topic which
should help.

Marc

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