[R] error: in catg (xi, name=nam, label=lab): "LO2" has <2 category levels

[Tvandenberg]

Dear R-users,

During a fit procedure in a  Logistic prediction model I encounter the
following problem:

error: in catg (xi, name=nam, label=lab: X has <2 category levels

The following code is used:

fit <-lrm(MRI_Diag_RC ~ factor(O4_1r) + N6_1r + leeftijd + LO1 + LO2 + LO3+
LO4+ LO5+ LO6+ LO7+ LO8+ LO9+ LO10+ LO11+ LO12+ LO13 + LO14+ LO15+ LO16+
LO17+ LO18+ LO19+ LO20+ LO21+ LO22+ LO23+ LO24 + LO26+ LO27 + LO29, model=T,
x=T, y=T, data=dat)

Most predictors are (dichotomous) nominal variables as is the problematic
"LO2". Does anyone know what the problem is and how I can correct it?

Kind regards,

Tobias



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