Summary statistics for meddrg0to992004_2007 dataset : by Jean Roth , jroth@nber.org , 14 Mar 2018 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- drg_cd | 2,228 290.4973 169.4855 1 999 year | 2,228 2005.5 1.118285 2004 2007 label | 0 nrecs | 2,137 26199.82 68091.39 0 787136 nppl_any | 2,135 23184.44 56243.07 0 552239 by Jean Roth , jroth@nber.org , 14 Mar 2018