Laura,
I have no experience with ivprob, but although designed for continuous
regressors maybe you can use it at least to test for exogeneity of a
binary regressor (see Wooldridge, 2002, sections 15.7.2f).
You can account for the endogeneity explicitly by estimating a bivariate
probit model using biprobit (see Wooldridge and Greene, 2003, ch. 21).
Fabbri et al. (2004) argue that this procedure also provides an
appropriate test of exogeneity.
Hope this helps.
Jonathan
References:
Fabbri, Daniele, Chiara Monfardini, and Rosalba Radice, 2004, Testing
exogeneity in the bivariate probit model: Monte Carlo evidence and an
application to health economics, mimeo.
Greene, William H., 2003, Econometric analysis (Prentice Hall: Upper
Saddle River, NJ).
Wooldridge, Jeffrey M., 2002, Econometric Analysis of Cross Section and
Panel Data (MIT Press: Cambridge, MA)).
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