Added variable plots

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add.var Added variable plots for current linear model

DESCRIPTION: Produces an added variable plot for each covariate in a linear model.

USAGE: add.var(lm.obj,...)

REQUIRED ARGUMENTS: lm.obj - a linear model object

OPTIONAL ARGUMENTS: Any argument suitable for the function drop1

EXAMPLES: lm.obj <- lm(y ~ x1+x2) par(mfrow=c(1,2)) add.var(lm.obj) # produces both added variable plots