MISSING Subcommand (CATPCA command)
In CATPCA, we consider a system-missing value, user-defined missing values,
and values that are less than 1 as missing values. The MISSING subcommand allows you to indicate
how to handle missing values for each variable.
PASSIVE. Exclude missing
values on a variable from analysis. This setting is the
default when MISSING is not specified.
Passive treatment of missing values means that in optimizing the quantification
of a variable, only objects with nonmissing values on the variable
are involved and that only the nonmissing values of variables contribute
to the solution. Thus, when PASSIVE is specified, missing values do not affect the analysis. Further,
if all variables are given passive treatment of missing values, objects
with missing values on every variable are treated as supplementary.
ACTIVE. Impute missing values. You can choose to use mode imputation. You can also consider objects with missing values on a variable as belonging to the same category and impute missing values with an extra category indicator.
LISTWISE. Exclude cases with missing values on a variable. The cases that are used in the analysis are cases without missing values on the specified variables. Also, any variable that is not included in the subcommand receives this specification.
- The
ALLkeyword may be used to indicate all variables. IfALLis used, it must be the only variable specification. - A mode or extracat imputation is done before listwise deletion.