[R] residual plots

From: Matt Scholz <scholzilla_at_gmail.com>
Date: Tue, 25 Nov 2008 13:48:15 -0700

I've fit a linear model to my data set using the <lm> function. One of the outputs of that function is a vector of the residuals. I would like to do a residual plot of this data versus a predictor variable, but the length of the residual vector is shorter than the length of the predictor variable vector. This is because when <lm> computes the residual vector, it deletes entries that came up NA (and lists these as a vector called na.action). Could someone please tell me how I can do a simple scatterplot of residuals v. predictor variable in an instance such as this? I'm not much of a code-jockey and haven't been able to find the right function if it exists.



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