search for: olttru

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2007 Nov 15
1
Why is model.matrix creating 2 columns for boolean?
...have a data frame "reading" that includes a logical variable "OLT" along with response variable "Reading" and predictor "True" (BOTH are numeric variables; it's "True" as in the true value). When I suppress the intercept, model.matrix gives me OLTTRUE and OLTFALSE columns. Why? Can I do anything to prevent it? > r <- model.matrix(Reading~0+OLT, reading) > r[1:5,] OLTFALSE OLTTRUE 1 1 0 2 1 0 3 1 0 4 1 0 5 1 0 > reading$OLT[1:2] [1] FALSE FALSE > r <- model.m...