To cite package 'longpower' in publications use:

Iddi S, Donohue MC (2022). “Power and Sample Size for Longitudinal Models in R-The longpower Package and Shiny App.” R Journal, 14(1), 264-281.

Donohue MC (2023). longpower: Power and sample size calculations for linear mixed models. R package version 1.0.24.

Diggle PJ, Heagerty PJ, Liang KY, Zeger SL (2002). Analysis of longitudinal data, Second Edition edition. Oxford Statistical Science Serires.

Liu G, Liang K (1997). “Sample size calculations for studies with correlated observations.” Biometrics, 53(3), 937-47.

Lu K, Luo X, Chen P (2008). “Sample size estimation for repeated measures analysis in randomized clinical trials with missing data.” International Journal of Biostatistics, 4(1), 937-47.

Hu N, Howard M, Thomas R (2021). “Power and sample size for random coefficient regression models in randomized experiments with monotone missing data.” Biometrical Journal, 63(4), 806-824.

Corresponding BibTeX entries:

  @Article{,
    title = {Power and Sample Size for Longitudinal Models in R-The
      longpower Package and Shiny App},
    author = {Samuel Iddi and Michael C. Donohue},
    journal = {R Journal},
    volume = {14},
    number = {1},
    pages = {264-281},
    year = {2022},
    publisher = {R Foundation for Statistical Computing},
  }

  @Manual{,
    title = {longpower: Power and sample size calculations for linear
      mixed models},
    author = {Michael C. Donohue},
    year = {2023},
    note = {R package version 1.0.24},
  }

  @Book{,
    title = {Analysis of longitudinal data},
    author = {P. J. Diggle and P. J. Heagerty and K. Y. Liang and S. L.
      Zeger},
    year = {2002},
    edition = {Second Edition},
    publisher = {Oxford Statistical Science Serires},
  }

  @Article{,
    title = {Sample size calculations for studies with correlated
      observations},
    author = {G Liu and KY Liang},
    year = {1997},
    journal = {Biometrics},
    volume = {53(3)},
    pages = {937-47},
  }

  @Article{,
    title = {Sample size estimation for repeated measures analysis in
      randomized clinical trials with missing data},
    author = {K Lu and X Luo and P-Y Chen},
    year = {2008},
    journal = {International Journal of Biostatistics},
    volume = {4(1)},
    pages = {937-47},
  }

  @Article{,
    title = {Power and sample size for random coefficient regression
      models in randomized experiments with monotone missing data},
    author = {Nan Hu and Mackey Howard and Ronald Thomas},
    journal = {Biometrical Journal},
    volume = {63},
    number = {4},
    pages = {806-824},
    year = {2021},
    publisher = {R Foundation for Statistical Computing},
  }