| ParamCubic {CluMP} | R Documentation |
Parameters of cubic model
Description
Default parameters to generate micro-panel (longitudinal) data with quadratic trend. The parameters may differ per each cluster. The parameters of each cluster are in rows. Number of rows denotes the number of clusters. Fixed effects are taken from Allen et al. (2005), and the source for random effects is Uher et al. (2017).
Usage
ParamCubic
Format
Its adviced to keep parameters in data.frame. The Parameters structure is as follows:
- b0
fixed parameter of intercept
- b1
fixed parameter of slope
- b2
fixed parameter of defining the quadraticity
- b3
fixed parameter of defining the cubicity
- varU0
variance of random factor U0 given to fixed parameter b0
- varU1
variance of random factor U1 given to fixed parameter b1
- corr
correlation between random factors U0 and U1
- varE
the variability of the residuals
Source
Allen, JS, Bruss, J, Brown, CK, Damasio, H. Normal neuroanatomical variation due to age: the major lobes and a parcellation of the temporal region. Neurobiol Aging. 2005 Oct;26(9):1245-60; discussion 1279-82.
Uher T, Vaneckova M, Krasensky J, Sobisek L, Tyblova M, Volna J, Seidl Z, Bergsland N, Dwyer MG, Zivadinov R, De Stefano N, Sormani MP, Havrdova EK, Horakova D. Pathological cut-offs of global and regional brain volume loss in multiple sclerosis. Mult Scler. 2017 Nov 1:1352458517742739. doi: 10.1177/1352458517742739.