st: ivprob problem

[Harald Seider <harald.seider@wiwi.uni-augsburg.de>]

Dear Statalist,

when running Joe Harness's ivprob procedure I always get an error message 
(conformability error). I have no clue why this procedure won't work.
I have about 250.000 observations which might be an issue. However, the 
error will also show up if we reduce the number of observations down to a 
few hundred.
The next issue might be the fact that many of our variables are dummies 
(d*, transfer, diag* , dum*).
Has anyone out there faced a similar problem before and know a solution for it?

ivprob mort30 ,
	endog(sqrtvol)
	exog(procptca d0* d1* d2* d3* d5*  transfer
	          diagalkalos_x diagamisequ diagarterem diagasthma_x diagatheros
         		diagbbblk_x diagcardiomeg_x diagchf diagchrglom diagchrlive_x 
diagchrpulh_x
         		diagchrrena diagcnsdis diagcollvas diagcopd diagdbtcmp 
diagdbtuncm diagdeg2avb
         		diagdement  diagepilep diagfractur diaggihemor diaghismali_x 
diaghrsecma
         		diaghtb diaghthrtf_x diaghyperli_x diagincorsy_x diaglrpmali_x 
diagmitvalv_x
         		diagnutri_x diagostarth_x diagothcva2 diagothvalv_x diagprcabg 
diagprevmi_x
         		diagpsychos diagshock_x diagsknulcr diagsyncop_x diagthyroid 
diagunstangina
                  	dum*)
	iv (dum*  pat3rad0to3   pat4rad3to7  pat7rad7to14  pat4rad14to18 
pat4rad18to22 hosprad*) ;

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