Function to check the format of 'gender' column in data
testGender(data, gendercode, gendercolumn = "gender", nrcode = NA)
a data frame
how gender is coded
column name for gender
non response code corresponding to gender column
0, if success -1 if failure
# NOT RUN { testGender(data.frame("sex"= c("m","f"), "Name"= c("John","Dora")),c("f", "m"),"sex",999) # }
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