Linear Mixed Models Statistics

Summary Statistics. Produces tables for:

  • Descriptive statistics. Displays the sample sizes, means, and standard deviations of the dependent variable and covariates (if specified). These statistics are displayed for each distinct level combination of the factors.
  • Case Processing Summary. Displays the sorted values of the factors, the repeated measure variables, the repeated measure subjects, and the random-effects subjects and their frequencies.

Model Statistics. Produces tables for:

  • Parameter estimates for fixed effects. Displays the fixed-effects parameter estimates and their approximate standard errors.
  • Tests for covariance parameters. Displays the asymptotic standard errors and Wald tests for the covariance parameters.
  • Correlations of parameter estimates. Displays the asymptotic correlation matrix of the fixed-effects parameter estimates.
  • Covariances of parameter estimates. Displays the asymptotic covariance matrix of the fixed-effects parameter estimates.
  • Covariances of random effects. Displays the estimated covariance matrix of random effects. This option is available only when at least one random effect is specified. If a subject variable is specified for a random effect, then the common block is displayed.
  • Covariances of residuals. Displays the estimated residual covariance matrix. This option is available only when a repeated variable has been specified. If a subject variable is specified, the common block is displayed.
  • Contrast coefficient matrix. This option displays the estimable functions used for testing the fixed effects and the custom hypotheses.

Confidence interval. This value is used whenever a confidence interval is constructed. Specify a value greater than or equal to 0 and less than 100. The default value is 95.

Obtaining Statistics for Linear Mixed Models

This feature requires SPSS® Statistics Standard Edition or the Advanced Statistics Option.

  1. From the menus choose:

    Analyze > Mixed Models > Linear...

  2. Optionally, select subjects and repeated variables, and then click Continue.
  3. In the Linear Mixed Models dialog box, click Statistics.
  4. Select one or more statistics.

Optionally, you can change the level of confidence.