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...e 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...