Package: longpower
Type: Package
Title: Sample size calculations for longitudinal data
Version: 1.0-1
Date: 2010-08-23
Author: Michael C. Donohue, Anthony C. Gamst, Steven D. Edland
Maintainer: Michael C. Donohue <mdonohue@ucsd.edu>
Description: The longpower package contains functions for computing
power and sample size for linear models of longitudinal data
based on the formula due to Liu and Liang (1997) and Diggle et
al (2002). Either formula is expressed in terms of marginal
model or Generalized Estimating Equations (GEE) parameters.
This package contains functions which translate pilot mixed
effect model parameters (e.g. random intercept and/or slope)
into marginal model parameters so that the formulas of Diggle
et al or Liu and Liang formula can be applied to produce sample
size calculations for two sample longitudinal designs assuming
known variance.
License: GPL (>= 2)
Depends: Matrix, lme4, methods
LazyLoad: yes
URL: http://math.ucsd.edu/~mdonohue
Packaged: 2010-09-01 18:47:57 UTC; mdonohue
Repository: CRAN
Date/Publication: 2010-09-01 20:05:12

Depends: R (>= 3.0.0), Matrix, lme4 (>= 1.0), nlme, methods

Title: Sample Size Calculations for Longitudinal Data
Maintainer: Michael C. Donohue <mdonohue@usc.edu>

Description: Compute power and sample size for linear models of longitudinal
data. Supported models include mixed-effects models and models fit by
generalized least squares and generalized estimating equations. Relevant
formulas are derived by Liu and Liang (1997) <DOI:10.2307/2533554>,

Package: longpower
Type: Package
Title: Sample size calculations for longitudinal data
Version: 1.0-2
Date: 2010-08-23
Author: Michael C. Donohue, Anthony C. Gamst, Steven D. Edland
Maintainer: Michael C. Donohue <mdonohue@ucsd.edu>
Description: The longpower package contains functions for computing
power and sample size for linear models of longitudinal data
based on the formula due to Liu and Liang (1997) and Diggle et
al (2002). Either formula is expressed in terms of marginal
model or Generalized Estimating Equations (GEE) parameters.
This package contains functions which translate pilot mixed
effect model parameters (e.g. random intercept and/or slope)
into marginal model parameters so that the formulas of Diggle
et al or Liu and Liang formula can be applied to produce sample
size calculations for two sample longitudinal designs assuming
known variance.
License: GPL (>= 2)
Depends: Matrix, lme4, methods
LazyLoad: yes
URL: http://math.ucsd.edu/~mdonohue
Packaged: 2012-05-31 17:13:04 UTC; mdonohue
Repository: CRAN
Date/Publication: 2012-05-31 17:32:04