st: rolling2 updated

The rolling2 routine, which provides a feature lacking from the official -rolling- prefix, has been updated to fix a bug caused by an official update. Thanks to Srobona Mitra for identifying the problem. The -rolling2- routine may be examined or downloaded via the -ssc- command or by -adoupdate-.

Kit

Kit Baum, Boston College Economics
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.stata-press.com/books/imeus.html

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