STATISTICS Subcommand (RELIABILITY command)

STATISTICS displays optional statistics. There are no default statistics.

• STATISTICS is cumulative. If you enter it more than once, all requested statistics are produced for each scale.

DESCRIPTIVES. Item means and standard deviations.

COVARIANCES. Inter-item variance-covariance matrix.

CORRELATIONS. Inter-item correlation matrix.

SCALE. Scale means and scale variances.

TUKEY. Tukey’s test for additivity. This helps determine whether a transformation of the items is needed to reduce nonadditivity. The test displays an estimate of the power to which the items should be raised in order to be additive.

HOTELLING. Hotelling’s T-square. This is a test for equality of means among the items.

ANOVA. Repeated measures analysis of variance table.

FRIEDMAN. Friedman’s chi-square and Kendall’s coefficient of concordance. These apply to ranked data. You must request ANOVA in addition to FRIEDMAN; Friedman’s chi-square appears in place of the usual F test. If the ANOVA keyword is not specified, the FRIEDMAN keyword is silently ignored.

COCHRAN. Cochran’s Q. This applies when all items are dichotomies. You must request ANOVA in addition to COCHRAN; the Q statistic appears in place of the usual F test. If the ANOVA keyword is not specified, the COCHRAN keyword is silently ignored.

ALL. All applicable statistics.