Summary statistics for ziphsahrr2007 dataset : by Jean Roth , jroth@nber.org , 14 Mar 2018 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- zipcode | 0 hsanum | 41,262 26721.9 15039.65 1001 53026 hsacity | 0 hsastate | 0 hrrnum | 41,262 257.9559 122.4094 1 457 -------------+--------------------------------------------------------- hrrcity | 0 hrrstate | 0 year | 41,262 2007 0 2007 2007 by Jean Roth , jroth@nber.org , 14 Mar 2018