Ambiguous abbreviation Error in a simple loop

[Nordi Klein]

Hey there, as student of political science, i have to make some regression analyses with Stata.
For this matter, i want to run a loop with jackknife regressions. So far i got the following code:

*Jackknife
levelsof iso, local(iso)
foreach i of local iso {
display "regression without iso 'i"
regress PolGen12_Diff8008 Instism5 GDPpcGoecd10 if iso != i }

This should give me my jackknife regressions and display witch country was left out. But instead i got this:

levelsof iso, local(iso)
36 40 56 124 208 246 250 276 300 372 380 392 528 554 578 620 724 752 756 826 840

. foreach i of local iso {
2. display "regression without iso 'i"
3. regress PolGen12_Diff8008 Instism5 GDPpcGoecd10 if iso != i }
regression without iso 'i
i ambiguous abbreviation

Can anybody help me solve this? Thx

[Joseph Coveney]

Try

levelsof iso, local(iso)
foreach i of local iso {
    display "regression without iso 'i'"
    regress PolGen12_Diff8008 Instism5 GDPpcGoecd10 if iso  != `i'
}

Have you considered the something like the following?

regress PolGen12_Diff8008 Instism5 GDPpcGoecd10, vce(jackknife, cluster(iso))

[William Lisowski]

A slight typo in Joseph's code above.

levelsof iso, local(iso)
foreach i of local iso {
    display "regression without iso `i'"
    regress PolGen12_Diff8008 Instism5 GDPpcGoecd10 if iso  != `i'
}

[Nick Cox]

Please post non-Mata questions in General.

[Nordi Klein]

Thank u guys, that works!
@ Nick Cox sry i gonna post further questions in the mata directory!