Summary statistics for drg1986 dataset : by Jean Roth , jroth@nber.org , 22 Apr 2016 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- drg | 0 drgnum | 477 239 137.8423 1 477 drgweight | 477 1.139228 .9719706 0 7.5688 drgsys | 0 drgvers | 477 3 0 3 3 -------------+--------------------------------------------------------- trim | 477 201.3836 76.23337 0 390 alos | 477 6.267086 3.902491 0 21.5 fydate | 477 9617 0 9617 9617 fyear | 477 1986 0 1986 1986 by Jean Roth , jroth@nber.org , 22 Apr 2016