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Function to check the format of a string column when the string values are given
test_data_string_restriction(data, column_name, nrcode = NA, allowed_strings)
0, if success error, if failure
data frame
the column name
non response code corresponding to the column
allowed strings or characters to represent meaningful entry
test_data_string_restriction( data.frame("Age" = c(21, 15), "sex" = c("m", "f")), "sex", -999, c("f", "m") )
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