[R] how to use anova() to test the sum of coefficients in nlme package

From: shirley zhang <shirley0818_at_gmail.com>
Date: Sat, 26 Jan 2008 10:53:59 -0500

Dear R-help,

In nlme package, anova () can be used to test the difference between two coefficients as shown on page 225
of "Mixed Effects Models in S and S-Plus":

anova(fm2BW.lme, L = c("Time:Diet2" = 1, "Time:Diet3" = -1))

Now my question is instead of test the difference between two coefficients, can I use anova to test the significance of the sum of two coefficients, like

anova(fm2BW.lme, L = c("Time:Diet2" = 1, "Time:Diet3" = 1))



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