I wanted to test the effectiveness of a particular type of "talking" therapy on depression. I envisaged selecting ONE group of people and measuring their heart rate and scores on depression scale for a period of 8 weeks. So I would have 8 measurements for the heart rate (session heart beat average) and 8 measurements for depression scale. How do I go about choosing the right statistical test, and how do I get my head around this in SPSS?!

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#### Best Answer

One way to approach this is to use **multilevel** modeling for longitudinal data.

If you would like to stay in SPSS, it is possible too. Below is a very readable book available through Amazon on this topic. It has a nice introduction to this method in general, and step-by-step examples with screenshots.

For adding time-varying covariates, please see Chapter 6, Model 2, Adding Time-Varying Covariates.

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