Hi!
Would anyone know how to generate a list of variable names from a data frame by
the class of the variable?
I have large tables with different numbers of columns and am trying to script
some rote analyses. There are several categorizing variables (factors) and many
response variables (integers and numeric). I want to extract a list of
classifier column names in one list and response variable names in another
list, then run for-loops to calculate various statistics on the response
variables in terms of the classifier variables. I thought something like this
might work (but didn't):
tmp<-dataframe
for (i in 1:length(tmp)){
if(class(tmp[[i]]=="factor") else tmp[[i]]<-NULL
}
factorlist<-names(tmp)
...
One problem is that the scope of the counter changes as I drop columns, but
there seems to be other problems as well
Any suggestions would be welcome. Thanks!
Jon
Soli Deo Gloria
Jon Erik Ween, MD, MS
Scientist, Kunin-Lunenfeld Applied Research Unit
Director, Stroke Clinic, Brain Health Clinic, Baycrest Centre
Assistant Professor, Dept. of Medicine, Div. of Neurology
University of Toronto Faculty of Medicine
Kimel Family Building, 6th Floor, Room 644
Baycrest Centre
3560 Bathurst Street
Toronto, Ontario M6A 2E1
Canada
Phone: 416-785-2500 x3648
Fax: 416-785-2484
Email: jw...@klaru-baycrest.on.ca
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