st: Remarks and questions on the VEC function

[Steve06 <fas@mit.edu>]

Hi,
i've tried Stata's VEC command to estimate a vector error correction model
with one co-integrating equation.
Here's what I found:
- all reported significance statistics are Z-statistics, while in published
empirical work you find t-statistics. I did not find a switch to change it
but would find it a good idea to have.
- if you specify a constant, you have it in both the main model and in the
cointegrating equation. If you specify no constant, it's neither in the main
model nor in the coint. equation, which is annoying, since you might want to
have a constant in the coint. equation but not in the main model.

Any suggestions how to overcome these limitations? Are there alternative VEC
functions by the Stata community? (like Xtabond2 vs Xtabond)

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