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SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

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GUTTMAN Guttman’s lower bounds for true reliability.<br />

RELIABILITY 1379<br />

PARALLEL Maximum-likelihood reliability estimate under parallel assumptions.<br />

This model assumes that items have the same variance but not necessarily<br />

the same mean.<br />

STRICTPARALLEL Maximum-likelihood reliability estimate under strictly parallel<br />

assumptions. This model assumes that items have the same means, the<br />

same true score variances over a set of objects being measured, and the<br />

same error variance over replications.<br />

STATISTICS Subcommand<br />

STATISTICS displays optional statistics. There are no default statistics.<br />

• STATISTICS is cumulative. If you enter it more than once, all requested statistics are<br />

produced for each scale.<br />

DESCRIPTIVES Item means and standard deviations.<br />

COVARIANCES Inter-item variance-covariance matrix.<br />

CORRELATIONS Inter-item correlation matrix.<br />

SCALE Scale means and scale variances.<br />

TUKEY Tukey’s test for additivity. This helps determine whether a transformation<br />

of the items is needed to reduce nonadditivity. The test displays<br />

an estimate of the power to which the items should be raised in order<br />

to be additive.<br />

HOTELLING Hotelling’s T-square. This is a test for equality of means among the<br />

items.<br />

ANOVA Repeated measures analysis of variance table.<br />

FRIEDMAN Friedman’s chi-square and Kendall’s coefficient of concordance.<br />

These apply to ranked data. You must request ANOVA in addition to<br />

FRIEDMAN; Friedman’s chi-square appears in place of the usual F test.<br />

If the ANOVA keyword is not specified, the FRIEDMAN keyword is<br />

silently ignored.<br />

COCHRAN Cochran’s Q. This applies when all items are dichotomies. You must<br />

request ANOVA in addition to COCHRAN; the Q statistic appears in<br />

place of the usual F test. If the ANOVA keyword is not specified, the<br />

COCHRAN keyword is silently ignored.<br />

ALL All applicable statistics.

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