st: log of zero

[Viktor Slavtchev <slavtchev@econ.mpg.de>]

dear stata listers,
I want to estimate production function in logs in order to interpret the 
coefficients in terms of elasticities. one of the RHS variables has a 
lot of zero value. in such cases, some people usually add a very small 
value in order to avoid the problem of 'undefined' log of zero. a 
similar issue was discussed some time ago among other things and in a 
quite different context but an interesting alternative suggestion was 
made (which I can't remember anymore). unfortunately, I was not able to 
find this particular thread.
in that sence, any suggestions how to deal with the problem would be 
greatly appreciated
thanks a lot
viktor
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/