[R] further on use of expand.model.frame

[John Fox]

Dear R-help list members,

Yesterday, I described a problem that I encountered with the use of 
expand.model.frame when the model object passed to this function was 
created without an explicit data argument in the call.

I've had no responses, but I've been able to work around the problem by 
making a change to expand.model.frame, replacing the line

	rval <- eval(call("model.frame", ff, data = data, subset = subset,
             	na.action = I), envir)

with

         rval <- if (is.null(data)) eval(call("model.frame", ff, subset = 
subset, na.action = naa), envir)
            	else eval(call("model.frame", ff, data = data, subset = 
subset, na.action = naa), envir)

This looks to me like a bug (I'm filing a report), but in any event I've 
solved my problem.

Thanks for your attention,
  John

-----------------------------------------------------
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario, Canada L8S 4M4
email: jfox at mcmaster.ca
phone: 905-525-9140x23604
web: www.socsci.mcmaster.ca/jfox
-----------------------------------------------------

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