| has_dont_know | R Documentation | 
Returns TRUE if x contains any instances of dk
has_dont_know(x, dk = "Don't Know")
| x | Character vector or factor | 
| dk | Character vector, containing search terms, e.g.  | 
TRUE or FALSE
Other Functions to clean data: 
encToInt(),
fix_common_encoding_problems(),
fix_levels_01_spss(),
intToEnc(),
leveltest,
remove_all_dont_know(),
remove_dont_know()
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