SPSS® 12.0 Command Syntax Reference

342 CSSELECT
CLASSMISSING Subcommand
The CLASSMISSING subcommand is used to control whether user-missing values of classification
(stratification and clustering) variables are treated as valid values. By default they are
treated as invalid.
EXCLUDE User-missing values of stratification and cluster variables are treated as invalid.
This is the default.
INCLUDE User-missing values of stratification and cluster variables are treated as valid
values.
CSSELECT always treats user-missing values of measure variables (previous weight, MOS,
size, and rate) as invalid.
DATA Subcommand
The DATA subcommand specifies general options concerning input and output files.
RENAMEVARS Keyword
The RENAMEVARS keyword specifies that existing variables should be renamed when the
CSSELECT procedure writes sample weight variables and stagewise output variables
requested in the plan file such inclusion probabilities.
• By default, an error is generated if variable names conflict.
• If output data are directed to the working data file RENAMEVARS specifies that an existing
variable should be renamed with a warning if its name conflicts with that of a variable
created by the CSSELECT procedure.
• If output data are directed to an external file RENAMEVARS specifies that a variable to be
copied from the working data file should be renamed with a warning if its name conflicts
with that of a variable created by the CSSELECT procedure. See the SAMPLEFILE subcommand
for details about copying variables from the working data file.
PRESORTED Keyword
By default CSSELECT assumes that the working data file is unsorted. The PRESORTED
keyword specifies that the data are sorted in advance, which may improve performance when
stratification and/or clustering is requested for a large sample frame.
If PRESORTED is used, the data should be sorted first by all stratification variables then by
cluster variables consecutively in each stage. The data can be sorted in ascending or
descending order. For example, given a sample plan created using the following CSPLAN
syntax the sample frame should be sorted by Region, Ses, District, Type, and School, in that
order.