[Richard Williams]

Hopefully that will take care of most or all of your problems. If not, see

http://www3.nd.edu/~rwilliam/xsoc63993/l11.pdf

especially the appendix.If you still have problems I am guessing there are non-obvious dependencies between the variables; getting more data probably isn't the solution, rather, you would need to rethink your dummies.

[Rich Goldstein]

responding to the second sentence in #29 above: use coldiag2 (SSC) which only requires the right-hand-side variables