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非常感谢版主提供的STATA12更新提示:20130709
-------- update 09jul2013 ----------------------------------------------------------------------
1. histogram incorrectly reported the syntax error "parentheses do not balance" when a
suboption of by() was specified with quoted spaces. This has been fixed.
2. intreg without option het() left behind an invalid e(V_modelbased) when vce(robust)
or vce(cluster ...) was specified. This only affected margins when option
vce(unconditional) was specified. This has been fixed.
3. margins has the following fixes:
a. margins with option vce(unconditional) used after xtmixed would produce a cryptic
error about not finding an equation. This has been fixed.
b. margins would report the warning "cannot perform check for estimable functions"
with reg3 results that did not contain constraints for factor variables. This
has been fixed.
c. margins was not properly handling quoted strings in option predict(), causing an
error while reporting results. This has been fixed.
4. marginsplot produced an error message or a plot with missing points when margins was
specified with option at() that set a value out of the range for a given regressor.
This was most common when the at() variable was of type byte and the at() value was
greater than 100. This has been fixed.
5. Mata function moptimize_result_display() with the Nelder-Mead technique and
constraints would report "estimates post: matrix has missing values" when it should
have reported the estimates table with missing standard errors. This has been fixed.
6. ml plot and ml graph, when specified to produce as many or more plotted points than
observations in the dataset, would exit with a Mata trace log when these commands
should have produced a graph. This has been fixed.
7. pwmean would interact only the first two variables specified in option over() when it
should have been interacting all the over() variables. This has been fixed.
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