The urge to imitate other statistical packages that rely on profusion of dummies should be resisted. R repression functions can handle factor variables.
-- David (Muphry) Winsemius (about factors in regressions...and the dangers of drinking and deriding)
R-help (September 2015) #Rstats
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RFortunes (rfortunes)'s status on Tuesday, 19-Mar-2019 10:00:02 CET RFortunes