On Sat, 25 Oct 2014, Sven Schreiber wrote: > just a small clarifying question: > > smpl some_zero_one_series --dummy > > and > > smpl some_zero_one_series --restrict > > are equivalent, right? For me they seem to give the same result, and > then I asked myself why the '--dummy' option exists at all. Am I missing > something? It's true, the --dummy flag is technically redundant given the --restrict flag. However, if I'm remembering right the --dummy option came first, so removing it would have been backward incompatible. Also, it might be considered user-friendly to retain the --dummy option (pun somewhat intended), in that people who are unfamiliar with programming concepts may not immediately see that if "foo" is an indicator variable the conditions "foo" and "foo != 0" are functionally identical. (Or in other words, plain "foo" may not look like a "restriction" as such.)