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  • Sample size calculation (general and relation to mixed linear model)

    Dear Statalisters

    I have a question that I hope you can help me with.

    I have searched the forums, the internet and available text books and have come up short - I use STATA/IC 16.0.

    Basically, I would like to perform a sample size calculation specific for a mixed model with repeated measures (w. correlation between repeated measures).

    Specifically, I would like a to reproduce something like the power repeated function specific for ANOVAs described in the STATA guide ( - just for a mixed linear model.

    First and foremost, any suggestions for a STATA function able to calculate a sample size specific for a mixed model with repeated measures is highly appreciated. Preferably with a function that does not require a prediction of error variance, as I do not have data to support a precise error variance.

    If a possibility for a similar calculation specific for mixed model does not exist in STATA - any suggestion of existing STATA functions in addition to the ANOVA function described in the link above is also appreciated.

    Thanks in advance, Jakob