Summary statistics for ziphsahrr2003 dataset : by Jean Roth , jroth@nber.org , 14 Mar 2018 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- zipcode | 0 hsanum | 41,373 26759.29 15044.71 1001 53026 hsacity | 0 hsastate | 0 hrrnum | 41,373 258.317 122.3689 1 457 -------------+--------------------------------------------------------- hrrcity | 0 hrrstate | 0 year | 41,373 2003 0 2003 2003 by Jean Roth , jroth@nber.org , 14 Mar 2018