Calculating Chow test in a loop and reporting them in a table

[Zoel MV]

Hello,

I have dataset divided by groups, and I am computing the Chow test for some subgroups of the sample (https://www.stata.com/support/faqs/s...how-statistic/). I am trying to report the statistic as one more statistic with estout using the following code:

sysuse auto, clear

eststo: reg price mpg
    scalar RSS_full = e(rss)
    scalar k        = e(rank) + 1

eststo clear    
forvalues i = 1/5 {

eststo: quietly reg price mpg if rep78 == `i'
    scalar RSS`i' = e(rss)
    scalar N`i'   = e(N)
    
quietly reg price mpg if rep78 != `i'
    scalar RSSn`i' = e(rss)
    scalar Nn`i'   = e(N)    
    
    estadd local chow = ((RSS_full - RSS`i' - RSSn`i')/k)/((RSS`i' + RSSn`i')/(N`i' + Nn`i' - 2*k))
}

esttab, s(N chow r2_a,label("N" "Chow Test" "Adjusted R2"))

The resulting output is the following:

That is, even though the Chow test has been properly calculated, it is not reported on the table. Instead I get the message

(tabulating estimates stored by eststo; specify "." to tabulate the active results)

But this only saves the last regression calculated... How can I properly report the chow statistic?

Thank you

[Andrew Musau]

estout is from SSC, as you are asked to explain (FAQ Advice #12).

sysuse auto, clear
estimates clear

eststo: reg price mpg
    scalar RSS_full = e(rss)
    scalar k        = e(rank) + 1

eststo clear    
forvalues i = 1/5 {

eststo: quietly reg price mpg if rep78 == `i'
    scalar RSS`i' = e(rss)
    scalar N`i'   = e(N)
    
quietly reg price mpg if rep78 != `i'
    scalar RSSn`i' = e(rss)
    scalar Nn`i'   = e(N)    
    
    estadd local chow = ((RSS_full - RSS`i' - RSSn`i')/k)/((RSS`i' + RSSn`i')/(N`i' + Nn`i' - 2*k)): est`i'
}

esttab, s(N chow r2_a,label("N" "Chow Test" "Adjusted R2"))