This zip file contains five data sets in Stata 7 format used as examples in the book: 

Hayes RJ, Moulton LH. Cluster Randomised Trials.
 Chapman & Hall/CRC 2009; Boca Raton, FL.

Also included are .hlp files that describe the contents of the data files.  These
that may be copied in the appropriate subfolders of a Stata installation for ready 
reference.  For example, share.hlp could go in c:\Program Files\Stata10\ado\updates\s
in a Windows installation.