R code generator uses factor levels for subsetting with numeric variable
Created by: mwip
Same prolbem with issue #69 (closed).
Possibly same solution could be applied.
str(pfad$xpop)
# Factor w/ 14 levels "[-6] Version of questionnaire with modified filtering",..:
pfad <- with(pfad, pfad[ (ypop == 1 | ypop == 2)| (xpop == 1 | xpop == 2)| (wpop == 1 | wpop == 2), ])