Summary statistics for ziphsahrr1997 dataset : by Jean Roth , jroth@nber.org , 14 Mar 2018 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- zipcode | 0 hsanum | 43,117 26748.02 15055.55 1001 53026 hsacity | 0 hsastate | 0 hrrnum | 43,117 258.3696 122.4036 1 457 -------------+--------------------------------------------------------- hrrcity | 0 hrrstate | 0 year | 43,117 1997 0 1997 1997 by Jean Roth , jroth@nber.org , 14 Mar 2018