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# Re: st: suest after ivregress or ivreg2

 From Austin Nichols To statalist@hsphsun2.harvard.edu Subject Re: st: suest after ivregress or ivreg2 Date Wed, 7 Apr 2010 15:27:14 -0400

```richard boylan <richardtb25@gmail.com> :
Why don't you frame your question using an example dataset?  The
question is far from complete as worded.
The second approach is the right answer for the relevant question,
modulo the treatment of the constant; compare:

est clear
sysuse nlsw88, clear
ta south smsa
reg wage hours if south
est sto south
reg wage hours if smsa
est sto smsa
suest south smsa
est sto suest
preserve
expand 2
bys idcode: g n=_n
keep if (n==1&south)|(n==2&smsa)
g hours1=hours*!(n==1&south)
g hours2=hours*!(n==2&smsa)
reg wage hours? n, cl(idcode)
est sto stacked
restore
esttab south smsa suest stacked, nogaps mti
* confirm stacked SEs match -suest- SEs above and coefs match in all cases.
ivreg wage (hours=tenure union) if south
est sto south
ivreg wage  (hours=tenure union) if smsa
est sto smsa
preserve
expand 2
bys idcode: g n=_n-1
keep if (n==0&south)|(n==1&smsa)
g hours1=hours*!(n==0&south)
g hours2=hours*!(n==1&smsa)
g ten1=tenure*!(n==0&south)
g ten2=tenure*!(n==1&smsa)
g union1=union*!(n==0&south)
g union2=union*!(n==1&smsa)
ivreg wage (hours?=ten? union?) n, cl(idcode)
est sto stacked
restore
esttab south smsa stacked, nogaps mti

On Wed, Apr 7, 2010 at 3:14 PM, richard boylan <richardtb25@gmail.com> wrote:
> I am trying to use suest after ivregress or ivreg2.
>
> I saw two answers both posted in 2009.
>
> The first one
> http://n2.nabble.com/st-Wald-test-across-equations-after-ivregress-or-ivreg2-td3312229.html
> just didn't work when I tried to replicate it.
>
> The second one
> http://n2.nabble.com/st-Compare-ivreg-coefficients-across-models-td4077316.html
> I wasn't sure if it was right nor not.
>
> I am just wondering if anyone had further insights since those postings.
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```