Unless you use VARDEF=DF, which is the default variance divisor, UCLM is set to
missing.
Using Weights
For more information about using weights and an example, see “WEIGHT” on page 75.
Data Requirements for Summarization Procedures
The following are the minimal data requirements to compute unweighted statistics and
do not describe recommended sample sizes. Statistics are reported as missing if
VARDEF=DF (the default) and the following requirements are not met:
•N and NMISS are computed regardless of the number of missing or nonmissing
observations.
•SUM, MEAN, MAX, MIN, RANGE, USS, and CSS require at least one nonmissing
observation.
•VAR, STD, ...
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