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Last data update: 2014.03.03

R: Adds actual numeric regressors for factor to dataframe as new...

varRegressors

R Documentation

Adds actual numeric regressors for factor to dataframe as new variables

Description

Adds new variables/columns in dataframe to represent numeric regressors for a factor. Factors are coded using their currently defined contrast codes. This function is useful for control of a factor covariate when graphing and ignoring this factor and/or other lower-level control variables. For this purpose, POC coding will typically be set for factor prior to using lm.codeRegressor

Usage

varRegressors(Data, VarName, RegressorNames = NULL)

Arguments

`Data`	The dataframe to add regressors
`VarName`	Character string name of variable to code regressor for
`RegressorNames`	Optional variable names for regressors.

Value

Returns original data frame (Data) with addition of new regressors.

Author(s)

John J. Curtin jjcurtin@wisc.edu

Examples

d = Ornstein
contrasts(d$nation) = varContrasts(d$nation, Type='POC', 
   POCList = list(c(3,-1,-1, -1),c(0,2,-1, -1), c(0,0,1,-1)))
d = varRegressors(d,'nation')