ivreg2 vs xtivreg2 for panel data

[Souryabrata Mohapatra]

Hi,
I'm confused about the use of ivreg2 and xtivreg2.
Both seem to work for panel data.
But the latter is restricted to fixed-effect.
The use of the former is clearer.
What's the difference and which to report?
Thanks,

[Andrew Musau]

ivreg2 and xtivreg2 are from SSC, as you are asked to explain (FAQ Advice #12). The difference corresponds to the difference between the official ivregress and xtivreg commands, respectively. One is a panel-data estimator and the other is for cross-sectional data. As it goes with linear estimators, one can use a cross-sectional estimator to estimate a panel data model by including indicators.