Missing-value functions take various numeric arguments and yield various types of results. Except where otherwise stated below, the normal rules of evaluation apply within expression arguments to these functions. In particular, user-missing values for numeric variables are converted to system-missing values.
(expr)
¶When expr is simply the name of a numeric variable, returns 1 if the variable has the system-missing value or if it is user-missing. For any other value 0 is returned. If expr takes another form, the function returns 1 if the value is system-missing, 0 otherwise.
(expr [, expr]…)
¶Each argument must be a numeric expression. Returns the number of
system-missing values in the list, which may include variable ranges
using the var1 TO var2
syntax.
(expr [, expr]…)
¶Each argument must be a numeric expression. Returns the number of
values in the list that are not system-missing. The list may include
variable ranges using the var1 TO var2
syntax.
(expr)
¶Returns 1 if expr has the system-missing value, 0 otherwise.