I'm interested in testing linear combinations of coefficients after models
like spautolm, errorsarlm, and lagsarlm in the spdep package. I'm used to
using "anova" for this, but the anova.sarlm implementation doesn't seem to
permit it straightforwardly. For instance, if I wanted to testing something
like b_1-.25*b_2=0, how would I go about doing that?

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