Tests the levels of x contain any instances of "Don't know". If so, replaces these levels with NA
removeDK(x, dk = "Don't Know")Character vector or factor
Character vector, containing search terms, e.g. c("Don't know", "Don't Know")
A factor with "Dont know" removed
Other Functions to clean data: encToInt,
fixCommonEncodingProblems,
fixLevels01R,
fixLevels01SPSS, fixLevels01,
hasDK, intToEnc,
leveltestR, leveltestSPSS,
removeAllDK