[R] help with svychisq
Emanuele Mazzola
mazzola at jimmy.harvard.edu
Thu Sep 10 22:51:29 CEST 2015
Hello,
I’m having a weird issue with the function “svychisq” in package “survey", which would be very helpful for me in this case.
I’m tabulating age categories (a factor variable subdivided into 4 categories: [18,25), [25, 45), [45,65), [65, 85) ) with respect to ethnicity/race (another factor variable subdivided into “hispanic white”, “non hispanic black”, “hispanic black”).
I’m perfectly able to get to the “svytable" object, which looks like this
> svytable(~age+ETN, design=sv1)
ETN
age hisp black hispanic white non hisp black
[18,25) 26.97019 798.87444 183.61834
[25,45) 145.19650 4783.47678 854.82748
[45,65) 104.83682 2537.15021 595.04924
[65,85] 0.00000 0.00000 0.00000
Since it has last row equal to 0 (which would give me troubles with the corresponding chi-square p-value), I try to get rid of it by using
> svytable(~factor(age)+ETN, design=sv1)
ETN
factor(age) hisp black hispanic white non hisp black
[18,25) 26.97019 798.87444 183.61834
[25,45) 145.19650 4783.47678 854.82748
[45,65) 104.83682 2537.15021 595.04924
which exactly responds to what I’m looking for and to what I’m expecting.
The design is built by using
sv1 = svydesign(ids=~factor(age)+ETN, weights=~WTFA.n, data=totfor)
Now, if I would like to evaluate the corresponding weighted chi squared test, I use
svychisq(~factor(age)+ETN, design=sv1)
but here’s what I get from R:
> svychisq(~factor(age)+ETN, design=sv1)
Error in `[.data.frame`(design$variables, , as.character(rows)) :
undefined columns selected
Maybe it is a stupid question but I really can’t figure out where the error is.
Could you please help me with this?
Thanks in advance for any information you will provide me with!
Emanuele
***********************************************************************
Emanuele Mazzola, Ph.D.
Department of Biostatistics & Computational Biology
Dana-Farber Cancer Institute
450 Brookline Ave
Mail Location: LC1056
Office Location: Longwood Center, Room 1056
Boston, MA 02215
Office phone 617-582-7614
Fax 617-632-2516
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