On May 20, 2010, at 11:24 AM, Sabatier, Jennifer F. (CDC/OID/NCHHSTP)
wrote:
Hi R-help,
I posted about this late yesterday but got no response. I may have put
TMI in the original request. Not to mention I couldn't cut and paste
yesterday because I was working R off a non-network computer while
asking for help on a network computer.
Essentially, I have this user-defined function:
test <- function(X){
chisq <- svychisq(~X + SEX, design=audit,
Did you really have a variable name "X" inside the object that you are
giving a temporary name of "X" to. Seems confusing if that were your
choice.
statisic="adjWald", round=4)
}
test(con)
I do not know the answer, but I'm not sure that anyone including
Lumley could answer it with the proffered information:
Perhaps you should include the code used to create "audit" as well as
the results of str() on the data argument to design when audit was
created. I am guessing that "SEX" is not available inside the function
and that you should have written:
test <- function(Z){
chisq <- svychisq(~X + SEX, design=Z,
statistic="adjWald", round=4)
}
--
David.
"con" is a data variable in my design object audit.
When I just run:
chisq <- svychisq(~X + SEX, design=audit, statisic="adjWald", round=4)
It works just fine.
It's only when it's nested in the function test() that it falls apart.
I get this error:
Error in `[.data.frame`(design$variables, , as.character(rows)) :
undefined columns selected
How can I solve this problem?
Thanks,
Jen (obviously a new R-user, as of late 2009)
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David Winsemius, MD
West Hartford, CT
______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
