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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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MANOVA: Multivariate 879<br />

ROTATE Rotation of the matrix of correlations between dependent and canonical variables.<br />

Specify rotation type VARIMAX, EQUAMAX, or QUARTIMAX in parentheses after this<br />

keyword.<br />

ALL RAW, STAN, ESTIM, COR, and ROTATE.<br />

By default, the significance level required for the extraction of a canonical variable is 0.25.<br />

You can change this value by specifying the keyword ALPHA and a value between 0 and 1 in<br />

parentheses:<br />

ALPHA The significance level required before a canonical variable is extracted. The<br />

default is 0.25. To change the default, specify a decimal number between 0 and 1<br />

in parentheses after ALPHA.<br />

• The correlations between dependent variables and canonical functions are not rotated<br />

unless at least two functions are significant at the level defined by ALPHA.<br />

• If you set ALPHA to 1.0, all discriminant functions are reported (and rotated, if you so request).<br />

• If you set ALPHA to 0, no discriminant functions are reported.<br />

POWER Subcommand<br />

The following specifications are available for POWER in multivariate analysis. For applications<br />

of POWER in univariate analysis, see MANOVA: Univariate.<br />

APPROXIMATE Approximate power values. This is the default. Approximate power values<br />

for multivariate tests are derived from procedures presented by Muller and<br />

Peterson (1984). Approximate values are normally accurate to three decimal<br />

places and are much cheaper to compute than exact values.<br />

EXACT Exact power values. Exact power values for multivariate tests are computed<br />

from the noncentral F distribution. Exact multivariate power values will be<br />

displayed only if there is one hypothesis degree of freedom, where all the<br />

multivariate criteria have identical power.<br />

• For information on the multivariate generalizations of power and effect size, see Muller<br />

and Peterson (1984), Green (1978), and Huberty (1972).<br />

CINTERVAL Subcommand<br />

In addition to the specifications described in MANOVA: Univariate, the keyword MULTIVARIATE is<br />

available for multivariate analysis. You can specify a type in parentheses after the MULTIVARIATE<br />

keyword. The following type keywords are available on MULTIVARIATE:<br />

ROY Roy’s largest root. An approximation given by Pillai (1967) is used. This<br />

approximation is accurate for upper percentage points (0.95 to 1), but it is<br />

not as good for lower percentage points. Thus, for Roy intervals, the user is<br />

restricted to the range 0.95 to 1.<br />

PILLAI Pillai’s trace. The intervals are computed by approximating the percentage<br />

points with percentage points of the F distribution.

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