I have been working on profit function estimated in seemingly unrelated regression. I need to compute confidence intervals for the price  and non-price elasticities estimated. I found some online resources given in the following link.

http://www.econ.uiuc.edu/~econ508/R/e-ta5_R.html

However, that is not much helpful since my covariance matrix resulted from SUR has 1000+ rows and columns and my equations in the SUR system are entered as formula and not as model. Any idea would be appreciated. 

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