Abstract

References
1.
Cox
N. J.
2002 . Speaking Stata: How to move step by: step . Stata Journal 2 : 86 –102 .
2.
Cox
N. J.
2007 . Speaking Stata: Identifying spells . Stata Journal 7 : 249 –265 .
3.
Newson
R.
2004 . Stata tip 13: generate and replace use the current sort order . Stata Journal 4 : 484 –485 .
