I have installed Hmisc and Design.  When I use ols, I get the  
following error message:

Error in if (!length(fname) || !any(fname == zname)) { :
	missing value where TRUE/FALSE needed

The model that I am running is:

 > ecools <- ols(eco$exp ~ eco$age + eco$own + eco$inc + inc2, x=TRUE)

I have tried several other combinations of arguments that take TRUE/ 
FALSE values, but no luck.

Ultimately, I am trying to calculate robust standard errors.

Any help would be appreciated.

Charles Evans
Executive Director
Free Curricula Center



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