In browsing the source I see the following construct:
res <- switch(type, working = , response = r, deviance = ,
pearson = if (is.null(object$weights))
r
else r * sqrt(object$weights), partial = r)
I understand that 'switch' will execute the code that is matched by its
corresponding string value (in this case 'type'). What I don't understand is
the empty code. Is this code saying that if the type is "deviance" then fill
the 'res' variable with an empty value? From my naive point of view it seems
that 'res' will only get a value(s) if 'type' is 'response', 'pearson', or
'partial'. Please help with my understanding.
Kevin Burton
rkevinbur...@charter.net
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