On May 20, 2010, at 4:32 PM, David Winsemius wrote:
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)
}
Oh, heck. Forgot to trim the address list. Looking at this again, I
think I see the OP's intent better. I still do not have the answer,
but believe the OP needs to construct a valid formula object if she
intends to pass only a column name to her function. Perhaps something
along the lines of:
test <- function(Z){
fmla <- as.formula( paste(" ~ ", paste(X, "SEX", collapse=
"+"))))
chisq <- svychisq( fmla, design=audit,
statistic="adjWald", round=4)
}
test(con)
--
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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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
