It's actually quite bizarre - the editor can't recognize the commands (shown as red) but the code executes anyways. The messages in the log apparently indicate successful execution, although I have to figure out whether it is possible to increase the number of iteration (the default maximum is 25 which means the grouping variable can't have many levels). Tom, are you able to recommend some good readings about the PROC PHREG? The SAS documentation seems not covering complicated datasets and options. Thanks.
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