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# Re: st: RE: new explanatory variable in a loop

 From Rodrigo Briceño <[email protected]> To [email protected] Subject Re: st: RE: new explanatory variable in a loop Date Tue, 7 Dec 2010 13:12:27 -0600

```thanks Nick. No, my dummy has 1s and 0s, based on some previous
analysis of residuals.

2010/12/7 Nick Cox <[email protected]>:
> Yes, you _can_ do that. The central line would become
>
> quietly regress liq `X' d`i' if isin2==`i'
>
> However, if each dummy is 1 if and only if the identifier is that named, then the dummy is identically 1 and no purpose is served thereby. Thus if -d3- is 1 if and only if -isin2- is 3, then your variable is just a constant.
>
> Nick
> [email protected]
>
> Rodrigo Briceño
>
> Hello again Stata listers. I am running several regressions (stata
> 9.2, windows XP) that contains a set of dummies (each dummy is defined
> as a "d" plus the identification number of the bond considered. So for
> id3, the dummy is d3, and so on. I made the following loop (this is a
> shortened version; the original include tests and exporting
> coefficients using estimates store and estout):
>
> loc X = "sap liqmk m2-m12 mes pprom"
> local isin "3 4 247 1 5 6"
> foreach i of local isin {
> quietly regress liq `X' if isin2==`i'
> }
>
> My question to the list is: can I include something like d`i'  as a
> new explanatory variable? What I need is that each regression include
> its corresponding dummy, so I can do the process automatically instead
> of typing individual commands:
>
> regress liq sap liqmk m2-m12 mes pprom d3 if isin2==3
> regress liq sap liqmk m2-m12 mes pprom d4 if isin2==4
>
>
> THanks
>
> --
> Rodrigo Briceño
> Economist
> [email protected]
> MSN: [email protected]
> SKYPE: rbriceno1087
>
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--
Rodrigo Briceño
Economist
[email protected]
MSN: [email protected]
SKYPE: rbriceno1087

*
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```