st: Fwd: Non linear estimation--variance of errors

[Andrew Hovel <hovel.andrew@gmail.com>]

I am trying to return an estimation of variance of errors (sigma^2)
following a function evaluator non-linear regression. -e(dev)- and
-e(rss)-  are not quite what I need. I am using Stata 12 for Windows.

The goal is to use the variance of errors as a transformation to allow
me to compare predicted values (currently expressed as natural logs)
to the non-log actual values of the dependent variable.

I use the following command:

nl (depvar = log({b0 =1} + {xb: var1 var2 ...varn})), variables(var1
var2 ...varn)

Here, "depvar" = ln(saleprice), where I want to compare actual
"saleprice" to predicted values.

Is there a saved estimation result I'm missing? Or perhaps someone
knows of an existing program to estimate variance of errors after
non-linear regression?

Thanks!
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