ParamQuadrat {CluMP}R Documentation

Parameters of quadratic model

Description

Parameters to generate panel 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

ParamQuadrat

Format

It is 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

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.


[Package CluMP version 0.8.1 Index]