In another thread, I wrote:
. . . commands like -bisect- or -ridder- come to mind.  (By
the way, all these do even now is just display--you cannot even get the
solution for workup.)
--------------------------------------------------------------------------------
Typing -return list-, as I had done, is not as it turns out the way to go
about finding what these commands return.  Examining the code for ridder
reveals that the result is returned in a global macro, $S_1.
Joseph Coveney
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/