The consequences of ignoring therapist effects in trials with longitudinal data: A simulation study.
Kristoffer MagnussonGerhard AnderssonPer CarlbringPublished in: Journal of consulting and clinical psychology (2018)
Researchers should account for therapist effects in the rate of change in longitudinal studies. To facilitate this, we developed an open source R package powerlmm, which makes it easy to investigate model misspecification and conduct power analysis for these designs. (PsycINFO Database Record
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