plotTR: Plot Trend Effects for LLRA

In eRm: Extended Rasch Modeling

Plot Trend Effects for LLRA

Description

Plots trend effects over time.

Usage

plotTR(object, ...)

Arguments

object	an object of class "llra"
...	Additional parameters to be passed to and from other methods

Details

The plot is a lattice plot with one panel. The effects for each items are plotted over the different time points.

Please note that all effects are to be interpreted relative to the baseline (i.e. t1).

Currently, this function only works for a full item x treatment x timepoints LLRA. Collapsed effects will not be displayed properly.

Warning:

Objects of class "llra" that contain estimates from a collapsed data matrix will not be displayed correctly.

Author(s)

Thomas Rusch

See Also

The plot method for treatment effects "plotGR".

Examples

##Example 6 from Hatzinger & Rusch (2009)
groups <- c(rep("TG",30),rep("CG",30))
llra1 <- LLRA(llradat3,mpoints=2,groups=groups)
summary(llra1)
plotTR(llra1)

## Not run:  
##An LLRA with 2 treatment groups and 1 baseline group, 5 items and 4
##time points. Item 1 is dichotomous, all others have 3, 4, 5, 6
##categories respectively.
ex2 <- LLRA(llraDat2[1:20],mpoints=4,groups=llraDat2[21])
plotTR(ex2)
## End(Not run)

eRm documentation built on May 29, 2024, 2:12 a.m.