If MISSING VALUES can be defined on STRING variables then why do NMISS and NVALID accept only NUMERIC variables and not allow for STRING variables?
get file="C:\Program Files\IBM\SPSS\Statistics\22\Samples\English\Employee data.sav".
freq gender.
missing values gender ("f").
freq gender /* Note gender is classified correctly assigned under missing */.
compute Check1=nvalid(gender).
* >Error # 4310 in column 29. Text: )
>The numeric argument required for the function specified was not supplied.
* >Execution of this command stops.
compute Check2=nmiss(gender).
* >Error # 4310 in column 28. Text: )
>The numeric argument required for the function specified was not supplied.
* >Execution of this command stops.
From CSR:
NMISS. NMISS(variable[,..]). Numeric. Returns a count of the arguments that have system- and
user-missing values. This function requires one or more arguments, which should be variable names inthe active dataset.
NVALID. NVALID(variable[,..]). Numeric. Returns a count of the arguments that have valid, nonmissing values. This function requires one or more arguments, which should be variable names in the active dataset.
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