AIC).nobs(object, ...)# S3 method for default
nobs(object, use.fallback = FALSE, ...)
NA."lm", "glm", "nls" and
"logLik", as well as a default method (which throws an
error, unless use.fallback = TRUE when it looks for
weights and residuals components -- use with care!). The main usage is in determining the appropriate penalty for BIC, but
nobs is also used by the stepwise fitting methods
step, add1 and drop1 as a
quick check that different fits have been fitted to the same set of
data (and not, say, that further rows have been dropped because of NAs
in the new predictors). For lm, glm and nls fits, observations with zero
weight are not included.AIC.