On Oct 8, 2010, at 4:37 PM, David Winsemius wrote:
On Oct 8, 2010, at 3:04 PM, Chagaris, Dave wrote:
I have a data set 382 rows and 63 columns. One of the columns is
bay, and there are 6 bays. But, the number of levels for this
factor is 7 when it should be six because there is some 'blank'
level "". When I subset for the blank level "", I get 0 rows.
How did you do the subset?
What in my data could be causing this? Thanks.
dim(datmtx)
[1] 382 63
datmtx$bay
[1] TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB
TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB
TB TB TB TB TB TB TB
[51] TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB
TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB
TB TB TB TB TB TB TB
[101] TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB
TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB
TB TB TB HI TB HI TB TB
[151] TB TB TB TB TB HI TB HI HI HI TB HI HI HI TB HI HI HI HI HI
HI HI HI TB TB TB TB CH CH TB CH CH CH CH CH CH CH CH CH CH TB TB
CH CH CH CH CH CH CH CH
[201] CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH CH
TB HI HI HI TB HI HI TB TB TB TB TB TB TB TB TB TB HI TB TB TB TB
TB TB TB TB TB TB TB TB
[251] TB HI HI HI CH CH CH CH CH CH CH CH CH CH HI HI CH CH CH CH
CH CH CH CH CH CH CH CH TB TB TB TB TB TB TB TB TB TB CH CH AP AP
AP AP AP AP HI HI HI CH
[301] CH CH CH AP AP TB TB AP AP AP AP AP AP SA BB BB TB TB TB TB
AP HI AP SA AP HI AP AP HI HI TB HI AP SA AP AP AP AP AP AP AP AP
SA AP AP SA AP AP AP SA
[351] SA SA AP AP AP CH CH CH CH CH AP BB BB BB BB BB TB CH CH CH
CH CH CH CH CH CH CH CH CH CH CH CH
Levels: AP BB CH HI SA TB
levels(datmtx$bay)
[1] "" "AP" "BB" "CH" "HI" "SA" "TB"
What do you get with:
which(!datmtx$bay %in% c( "AP", "BB", "CH", "HI," "SA", "TB") )
It occurs to me that you should also report:
which(!levels(datmtx$bay) %in% c( "AP", "BB", "CH", "HI," "SA",
"TB") )
Since you will not necessarily have all levels represented by existing
instances. If you created the factor and then filled in a blank
instance, the earlier blank level would persist. If you want to
collapse the levels in your factor vector so that they are all
represented then you can do:
datmtx$bay <-factor(datmtx$bay)
--
David.
nlevels(datmtx$bay)
[1] 7
David Chagaris
Associate Research Scientist
Florida Fish and Wildlife Conservation Commission
Florida Fish and Wildlife Research Institute
100 8th Ave SE
St. Petersburg, FL 33701
(727) 896-8626 ext. 4305
(727) 893-1374 fax
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David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
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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
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
