Error mean square

If rb.lm is an lm-object, I can access the error mean square as

s2 <- sum(rb.lm$residuals^2)/rb.lm$df.residual


This seems a bit like hard work for such a commonly wanted quantity. Is
there a better way to do this?

Murray Jorgensen



Dr Murray Jorgensen      http://www.stats.waikato.ac.nz/Staff/maj.html 
Department of Statistics, University of Waikato, Hamilton, New Zealand 
Email: maj at waikato.ac.nz                            Fax +64-7 838 4155
Phone +64-7 838 4773 home phone +64-7 856 6705  Mobile +64-21 139 5862

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