ParamExpon: Parameters of exponential model

Description Usage Format Source

Description

Default parameters to generate micro-panel (longitudinal) data with exponencial 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 Jones et al. (2013).

Usage

1

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 decay

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

Jones BC, Nair G, Shea CD, Crainiceanu CM, Cortese IC, Reich DS. Quantification of multiple-sclerosis-related brain atrophy in two heterogeneous MRI datasets using mixed-effects modeling. Neuroimage Clin. 2013 Aug 13;3:171-9. doi: 10.1016/j.nicl.2013.08.001.


CluMP documentation built on Nov. 27, 2020, 9:06 a.m.

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