SPSS® 12.0 Command Syntax Reference

Options
Model Type. You can specify any one of five models on the MODEL subcommand.
RELIABILITY 1377
Statistical Display. Statistics available on the STATISTICS subcommand include descriptive
statistics, correlation and covariance matrices, a repeated measures analysis of variance table,
Hotelling’s T-square, Tukey’s test for additivity, Friedman’s chi-square for the analysis of
ranked data, and Cochran’s Q.
Computational Method. You can force RELIABILITY to use the covariance method, even when
you are not requesting any output that requires it, by using the METHOD subcommand.
Matrix Input and Output. You can read data in the form of correlation matrices and you can
write correlation-type matrix materials to a data file using the MATRIX subcommand.
Basic Specification
The basic specification is VARIABLES and a variable list. By default, RELIABILITY displays
the number of cases, number of items, and Cronbach’s alpha. Whenever possible, it uses an
algorithm that does not require the calculation of the covariance matrix.
Subcommand Order
• VARIABLES must be specified first.
• The remaining subcommands can be named in any order.
Operations
• STATISTICS and SUMMARY are cumulative. If you enter them more than once, all requested
statistics are produced for each scale.
• If you request output that is not available for your model or for your data, RELIABILITY
ignores the request.
• RELIABILITY uses an economical algorithm whenever possible but calculates a covariance
matrix when necessary (see the METHOD subcommand on p. 1381).
Limitations
Example
• Maximum 1 VARIABLES subcommand.
• Maximum 1 SCALE subcommand.
• Maximum 500 variables on the VARIABLES subcommand.
• Maximum 500 variables on the SCALE subcommand.
RELIABILITY VARIABLES=SCORE1 TO SCORE10.