In reply to van.

Van, I asked Rick Wicklin, and he responded with this:

The F statistic is not part of the OUTEST= data set, so use ODS OUTPUT ANOVA=datasetname;

proc reg data=sashelp.class;
ods output ANOVA=anova;
model weight=height;
run;

proc print data=anova(where=(source="Model"));
var FValue;
run;