*! version 0.5.0 26May2009
help gcprvalue: Compute group differences in predictions \ 0.5.0 2009-05-26.

Title

gcprvalue -- Computes group differences in predicted probabilities by
running a pair of prvalue commands. Options simplify constructing predictions
for useful sets of values for the RHS variables. Essentially, the command is a wrapper
for making it easier to use prvalue.

Syntax

gcprvalue
,
[
nointeract
grandmean
groupmean
crossmean
x(variable=value...)
xis(variable=value)
reset
matrix(string)
skip
label(string)
print
bounds
title(string)
noval
quietly
verbose
]

Description

gcprvalue computes group differences in predicted probabilities along with
confidence intervals (upper and lower bounds) for the group differences in
predictions. It can record the predictions to a matrix for later printing
with gcresults.

Options

nointeract indicates that predictions should be based on the non-interaction model
(i.e., only a dummy variable for group membership is included).
By default, the interactive model is assumed.

grandmean sets variables for both groups to the combined means.

groupmean sets variables for each group to the means for their own group.

crossmean sets variables for each group to the means for the other group.

x() specifies the levels of RHS variables as with prvalue.

xis() is the value being varied in the row of the matrix. This is used by
gcprgen to record the x-axis values for the plots.

matrix() is the name of the matrix to hold the predictions.

reset will reset the matrix to null and start recording again.

label() provides a text label for the row holding the predictions.

skip adds a blank row to the matrix to make it easier to read.

print will print the matrix.

title() is the title used as a header when printing the matrix

bounds print the upper and lower bounds.

noval suppresses printing the values set by xis().

verbose prints the globals used.

quietly surpresses output.

Examples

. gcprvalue...

Saved globals and variables

Globals

a ...to be added

b ...to be added

Variables

a ...to be added

b ...to be added