Re: st: lock variable in model so that swaic cannot remove it

[Nick Cox <njcoxstata@gmail.com>]

-swaic- is a user-written command. Please remember that you are asked
to explain where user-written commands you refer to come from. In this
case I doubt that either author is a member of the list, and I know
that Tom Steichen is very firmly retired.

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SJ-5-4  sg134_1 . . . . . . . . . . . . . . . . . .  Software update for swaic
        (help swaic if installed) . . . . . . . . . Z. Wang and T. J. Steichen
        Q4/05   SJ 5(4):607
        has new varwidth option, now works with xi, and now works
        after clogit

STB-54  sg134 . . . . . Model selection using the Akaike information criterion
        (help swaic if installed) . . . . . . . . . . . . . . . . . .  Z. Wang
        3/00    pp.47--49; STB Reprints Vol 9, pp.335--337
        command for stepwise model selection using the Akaike
        information criterion (AIC)