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I've run an ANOVA with SAS PROC GLM, but when I look at my output, all I get are missing values (period symbols) instead of F-ratios and p-values. Why is SAS doing this?
One reason that SAS may not give you F-tests and the corresponding p-values is that you have specified a saturated model. For example, you may have asked SAS to estimate as many parameters as there are cells in your ANOVA. Thus you do not have a sufficient number of degrees of freedom to obtain the desired F-tests. The remedy is to specify an unsaturated model, i.e., by including fewer effects in the model.
If you have further questions, send E-mail to stats@ssc.utexas.edu.