| ParamExpon {CluMP} | R Documentation |
Parameters of exponential model
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
ParamExpon
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.