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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: How to get results from -selectvars- |

Date |
Wed, 14 Nov 2007 23:02:30 -0000 |

-selectvars- is a program on SSC. (Reminder: You are asked to make clear where user-written stuff you refer to comes from.) I located -selectvars- and found the following within its help. In short, -selectvars- is stated to save results in r(varlist) and an example is given of how you may use its saved results. An alternative for similar problems is -tuples- from SSC. ------------------------------------------------------------------------ ---------------------------------------- help for selectvars ------------------------------------------------------------------------ ---------------------------------------- Selecting all possible n-tuples from a varlist selectvars varlist [, min(#) max(#) ] Description selectvars produces a list of all possible n-tuples from a list of variable names. That is, given a list of k variable names, it produces the empty list; all possible distinct singletons (each individual variable name); all possible distinct pairs; and so forth. Tuples are bound in " ". As selectvars is intended for programming, the list is not displayed, but left behind as a saved result. Note that there is no checking of a possible error with even modest k: that a full list of (at most 2^k) tuples can not be accommodated in a macro. Options min(#) specifies a minimum value for the number of names in a tuple. max(#) specifies a maximum value for the number of names in a tuple. Examples . selectvars headroom trunk length displacement . foreach v in `r(varlist)' { . regress mpg `v' . } . selectvars headroom trunk length displacement, min(2) max(2) Saved results r(varlist) list of tuples tiago.pereira@incor.usp.br I think that -selectvars- will be useful in my current program, but, as a beginner, could not understand how the results are saved.

**References**:**st: How to get results from -selectvars-***From:*tiago.pereira@incor.usp.br

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