I am investigating the efficacy of Gestalt therapy with adolescents engaging in self-harm, using a single case experimental design. I have administered some tools to measure the level of self-harm, anxiety and depression at baseline, after 15 sessions and after 30 sessions. What statistical measures would you suggest I use to show the effect of the treatment besides visual analysis?
Paired sample t-tests could be a simple approach to look at differences in a single variable from pre treatment to post treatment.
If self-harm, anxiety and depression are measured with e.g. 3-4 questions like do you cut yourself, do you think about suicide and so on at 3 different time points you can use Friedman test for related groups. You can look at our single case.
If you just need a simple comparison, paired sample t-tests, but if you want to compare more parameters, you need anova non-parametric test as Friedman test.
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