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. 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"
> 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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