Fix level formatting of all question with Yes/No type answers.
leveltest_spss(x)
leveltest_r(x)
surveydata object
Other Functions to clean data:
encToInt()
,
fix_common_encoding_problems()
,
fix_levels_01_spss()
,
has_dont_know()
,
intToEnc()
,
remove_all_dont_know()
,
remove_dont_know()