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Re: st: can cond() be nested (within nl)?

From   Nick Cox <>
Subject   Re: st: can cond() be nested (within nl)?
Date   Mon, 3 Dec 2012 10:39:05 +0000

It is perfectly legal to include -cond()- within the <sexp> in

nl (depvar=<sexp>) [if] [in] [weight] [, options]

if that is what you mean. But -mkspline- followed by -regress- sounds
much easier here.

On Mon, Dec 3, 2012 at 9:59 AM, David Raitzer <> wrote:

I am trying to do a segmented linear regression with the nl function
and cond.  The intention is to have two breakpoints and 3 segments,
which means that 3 conditions are required.   Can cond be nested
within nl to apply more than 2 conditions?  If not, what is the best
way to approach such a regression when the segmentation depends upon 3
ranges of an x, rather than only 2? Thanks!
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