Hi:
The tabular output from PROC REG is being routed to the ODS RTF file. The output dataset, WORK.EST4 (from your OUTEST= option) is NOT being routed to the RTF file. It is sitting in the WORK library.
If you want to see what's inside the WORK.EST4 file, as you would see, if you did a PROC PRINT, then I suggest that you put a PROC PRINT step for WORK.EST4 before your ODS RTF CLOSE; statement. Just because you name the RTF file EST4.RTF does not mean that the dataset WORK.EST4 will automatically be routed to the RTF file.
cynthia