RE: st: how to make xi dummies inherit labels

[Roger Harbord <Roger.Harbord@bristol.ac.uk>]

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
>
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