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Thread: Power analysis for time series regression

  1. #1

    Power analysis for time series regression

    Hello, I'm trying to determine the sample size I need for a study. In the analysis, I will be including three predictors (score on a questionnaire, time, scorextime interaction) and one outcome variable. I am only using one group of individuals and collecting data at baseline, time 1, time 2, and time 3 (and maybe time 4). This is in a single group of individuals. How can I best determine the sample size needed?

    Thanks in advance!

  2. #2
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    Re: Power analysis for time series regression

    this would be a longitudinal study: check out this presentation http://bstt513.class.uic.edu/Pow2gLS.pdf


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