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  \code{nobs} is also used by the stepwise fitting methods
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  \code{nobs} is also used by the stepwise fitting methods
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  \code{\link{step}}, \code{\link{add1}} and \code{\link{drop1}} as a
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  \code{\link{step}}, \code{\link{add1}} and \code{\link{drop1}} as a
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  quick check that different fits have been fitted to the same set of
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  quick check that different fits have been fitted to the same set of
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  data (and not, say, that further rows have been dropped because of NAs
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  data (and not, say, that further rows have been dropped because of NAs
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  in the new predictors).
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  in the new predictors).
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  For \code{lm}, \code{glm} and \code{nls} fits, observations with zero
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  For \code{lm}, \code{glm} and \code{nls} fits, observations with zero
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  weight are not included.
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  weight are not included.
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}
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}
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\value{
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\value{
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  A single number, normally an integer.  Could be \code{NA}.
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  A single number, normally an integer.  Could be \code{NA}.