# Re: st: Ignore dummy variable in predict function?

 From Dorothy Bridges To statalist@hsphsun2.harvard.edu Subject Re: st: Ignore dummy variable in predict function? Date Tue, 10 Nov 2009 08:47:00 -0500

```Marvelous, thank you!

On Mon, Nov 9, 2009 at 5:45 PM, Maarten buis <maartenbuis@yahoo.co.uk> wrote:
> --- On Mon, 9/11/09, Dorothy Bridges wrote:
>> Now I would like to generate predicted values of le, **as
>> if** all of the method-a observations had been created using
>> method b.
>
> *------------------ begin example --------------------
> sysuse uslifeexp.dta, clear
>
> **(Imitating my actual data)
> gen le_measure1=.
> replace le_measure1=le-5 if year<=1950 | year==1965 | year==1972 | ///
> year==1986 | year==1989
> replace le_measure1=le if le_measure1==.
>
> **The regression:
> gen measuredummy=1
> replace measuredummy=0 if le_measure1==le
>
> regress le_measure1 year measuredummy
>
> clonevar temp = measuredummy
>
> replace measuredummy = 0
> predict le0, xb
>
> replace measuredummy = 1
> predict le1, xb
>
> replace measuredummy = temp
> drop temp
>
> twoway scatter le_measure1 year if measuredummy == 0 || ///
>       scatter le_measure1 year if measuredummy == 1 || ///
>       line le0 year                                 || ///
>       line le1 year,                                   ///
>       legend(order(1 "measure 0"                       ///
>                    3 "measure 0"                       ///
>                    - " "                               ///
>                    2 "measure 1"                       ///
>                    4 "measure 1" ))
> *---------------------- end example -----------------------------
>
> Hope this helps,
> Maarten
>
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
> http://www.maartenbuis.nl
> --------------------------
>
>
>
>
>
>
> *
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>

*
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```