plotworth {prefmod}R Documentation

Function to plot worth parameters from pattern models

Description

A plot of the worth parameter matrix obtained from the fit of a pattern model is produced. The worth parameter matrix is produced by patt.worth.

Usage

plotworth(worthmat, main = "Preferences", ylab = "Estimate", psymb = NULL, ylim = range(worthmat))

Arguments

worthmat worth parameter matrix, object of class pattW. Alternatively, the contents of a user defined matrix can also be plotted (for an example see llbt.design, provided that the rows correspond to objects and the columns to groups.
main main title of the plot.
ylab y-axis label
psymb plotsymbols for objects, see Details below
ylim limits for y-axis

Details

Plotsymbols can be defined as an integer vector of length equal to the number of objects, e.g., psym = c(15,22,18). They specify the graphical option pch as used in the points function. The default (psymb = NULL) uses the symbols 15 through 18 and 21 through 25. The number of symbols is determined from the number of rows in worthmat. A display of some plotsymbols may be obtained from the correponding example below.

Author(s)

Reinhold Hatzinger

See Also

patt.worth

Examples

    ## display of some plotsymbols (pch)
    plot(0:25,rep(1,26),pch=0:25,cex=1.5)
    text(0:25,rep(0.95,26),0:25)

    ## fit only first three objects with SEX effect
    data(cemspc)
    m2<-pattPC.fit(cemspc, nitems=3, formel=~SEX, elim=~SEX, undec=TRUE)

    ## calculate and plot worth parameters
    m2worth<-patt.worth(m2)
    plotworth(m2worth)
    

[Package prefmod version 0.8-13 Index]