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From |
"Michael Blasnik" <michael.blasnik@verizon.net> |

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

Subject |
st: Re: Is Stata smart enough to avoid unnecessary repetition? |

Date |
Sun, 14 Dec 2003 14:31:34 -0500 |

If you type out the full command, then Stata will re-do the analysis. Replaying results will prove to be much faster than re-estimating the command, especially when you're working with large datasets or complex estimation commands. Michael Blasnik michael.blasnik@verizon.net ----- Original Message ----- From: "Richard Williams" <Richard.A.Williams.5@nd.edu> To: <statalist@hsphsun2.harvard.edu> Sent: Saturday, December 13, 2003 7:29 PM Subject: st: Is Stata smart enough to avoid unnecessary repetition? > Is Stata smart enough to know when it already has the necessary information > calculated for an estimation command? For example, if I do > > regress y x1 x2 x3 > regress y x1 x2 x3 > > will stata redo the regression or will it know that it has already done it > and just replay the results? Or, less obviously, if you do something like > > regress y x1 x2 x3 > pcorr y x1 x2 x3 > > the -pcorr- command will quietly regress y x1 x2 x3. Will Stata do that > regression anew or does it know it doesn't need to bother? > > If Stata is smart enough to avoid repetition, will it also be smart enough > to know that it must start from scratch if the data have been edited or > changed? > > Put another way, does it make any difference whether I just replay results > (e.g. type -regress- with no arguments) as opposed to repeating the > original complete command? > > I've been using Stata with small data sets and it seems extremely > fast. But, I may start using it with some enormous data sets, and I'm also > starting to write some ado files, and I'm wondering whether I have to worry > about how efficient my commands are or if Stata will choose the optimal > strategy. > > > > ------------------------------------------- > Richard Williams, Associate Professor * * 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/

**Follow-Ups**:**Re: st: Re: Is Stata smart enough to avoid unnecessary repetition?***From:*David Kantor <dkantor@jhu.edu>

**References**:**st: Is Stata smart enough to avoid unnecessary repetition?***From:*Richard Williams <Richard.A.Williams.5@nd.edu>

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