根据stata官网的信息，stata13已经更新至2014年11月07日：
http://www.stata.com/support/updates/



. help whatsnew
-------- update 07nov2014 -------------------------------------------------------------------------------------------------

     1.  collapse with option percent now reports percentages rather than proportions.

     2.  estat summarize after gsem ignored all arguments and options.  This has been fixed.

     3.  graph bar and graph dot with option percent now report percentages rather than proportions.

     4.  ksmirnov, exact could report an incorrect p-value because of numerical precision for the two-sample exact test
         when the number of observations in at least one group was not equal to a power of 2.  In such cases, the
         reported p-value was too small.  This has been fixed.

     5.  levelsof, when used with a variable containing all missing values, returned an uninformative error message when
         it should have returned "no observations".  This has been fixed.

     6.  testnl has the following fixes:

         a.  testnl, when used with survey data, incorrectly reported an F statistic by default instead of a chi-squared
             statistic.  This has been fixed.

         b.  testnl, when used with survey data, ignored the specified option df().  This has been fixed.