[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

From |
John Hendrickx <john_hendrickx@yahoo.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
RE: st: how to make xi dummies inherit labels |

Date |
Thu, 3 Oct 2002 04:33:16 -0700 (PDT) |

Hi Roger, -desmat- should add a few seconds to your calculations but two minutes is way too much. One explanation might be that a continuous variable wasn't specified as such, then -desmat- will create dummies for all 100+ categories and estimation will take a long time. Let me know if -desmat- really slows things down that much on a large dataset, maybe it would be worthwhile to create a lite version. As for exponential coefficients, use the -exp- option, desmat: logistic y x, exp will give the same results as xi: logistic y i.x -logistic- prints exponential coefficients but saves them as loglinear values. Good luck, John Hendrickx --- Roger Harbord <Roger.Harbord@bristol.ac.uk> wrote: > What I was really after in the end was similar to the output of > e.g. > . xi: logistic y i.x > . reformat, eform > > - but with the coefficients labelled using the value labels > assigned to x. > -desmat- does achieve this, but I had a couple of different > problems when I > tried -desmat-: > > 1) It takes over 2 minutes to run the first univariable logistic > regression > with -desmat- on my data , when -xi- is seemingly instant. May be > connected to the fact that my dataset has 1100 variables (and 2400 > observations). Much quicker subsequently though, even run on > different > variables. > > 2) I can't see how to get -desmat- to exponentiate the coefficients > (to > give odds ratios with logistic regression) when used as a command > prefix: > > . desmat: logistic y i.x > > gives the same output as: > > . desmat: logit y i.x > > - and there's no -eform- option as there is with -outreg- and > -reformat-. > > Also I think -reformat- or -outreg- give me more flexibility in > deciding > what I want in the output, so I don't need to do so much work on > the output > before I present it to my client, which is ultimately my aim. > > In conclusion i'll probably use Nick's 'canned solution' for > transferring > value labels to variable labels of dummies, in combination with > -reformat- > or -outreg-. But maybe it would be nice if there was an option for > -xi- to > tell it to inherit the labels in this way. Put that on the wish > list for > Stata 8... > > > Roger. > ---------------------------------------------------- > Roger Harbord mailto:roger.harbord@bristol.ac.uk > Department of Social Medicine, University of Bristol > > > > --On 03 October 2002 09:33 +0100 Nick Cox <n.j.cox@durham.ac.uk> > wrote: > > > John Hendrickx > > > >> -desmat- will do this. Try -ssc describe desmat- > > > > I tried -desmat- after my posting. I couldn't > > see that it did quite this. > > > > Example: > > > > > ---------------------------------------------------------------------- > > ------------------------------------- > > log: C:\Stata7\desmat.log > > log type: text > > opened on: 3 Oct 2002, 09:30:21 > > > > . u auto > > (1978 Automobile Data) > > > > . desmat : regress mpg foreign > > > ---------------------------------------------------------------------- > > --------- > > regress > > > ---------------------------------------------------------------------- > > --------- > > < snip > > > > ---------------------------------------------------------------------- > > --------- > > nr Effect > Coeff > > s.e. > > > ---------------------------------------------------------------------- > > --------- > > foreign > > 1 Foreign > 4.946** > > 1.362 > > 2 _cons > 19.827** > > 0.743 > > > ---------------------------------------------------------------------- > > --------- > > * p < .05 > > ** p < .01 > > > > . d _x_1 > > > > storage display value > > variable name type format label variable label > > > ---------------------------------------------------------------------- > > --------- > > _x_1 byte %8.0g foreign==1 > > > > > > . tab foreign > > > > Car type | Freq. Percent Cum. > > ------------+----------------------------------- > > Domestic | 52 70.27 70.27 > > Foreign | 22 29.73 100.00 > > ------------+----------------------------------- > > Total | 74 100.00 > > > > > > That is, the variables created do not inherit value labels, > > which I understood be what Roger wanted. > > > > Nick > > n.j.cox@durham.ac.uk > > > > * > > * 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/ > > > * > * 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/ __________________________________________________ Do you Yahoo!? New DSL Internet Access from SBC & Yahoo! http://sbc.yahoo.com * * 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: how to make xi dummies inherit labels***From:*Roger Harbord <Roger.Harbord@bristol.ac.uk>

**References**:**RE: st: how to make xi dummies inherit labels***From:*Roger Harbord <Roger.Harbord@bristol.ac.uk>

- Prev by Date:
**Re: st: using stcox with clustered data** - Next by Date:
**Re: st: about gini** - Previous by thread:
**RE: st: how to make xi dummies inherit labels** - Next by thread:
**RE: st: how to make xi dummies inherit labels** - Index(es):

© Copyright 1996–2016 StataCorp LP | Terms of use | Privacy | Contact us | What's new | Site index |