On Wed, 21 Apr 2010, Summers, Peter wrote:
Many thanks for your prompt replies. Your point about the
ill-conditioned instrument matrix makes perfect sense (I'd wondered why the info
criteria were showing "1.#INF00").
I've tested the latest cvs with the following model
X = {const black ed76 smsa76 south76 exp76}
Z = {const black age76 smsa66 south66 nearc4b}
The weak instrument test is still sensitive to the order of the
instruments...
The changes I made last night were in CVS only. The snapshots for
Windows and Mac are now updated. You shouldn't see that
sensitivity any more.
I'm still not sure about the df in the Hausman test though. In
the last model it seems to me that this should be 2, not 1...
I will take another look at that.
Allin