Summary statistics for ziphsahrr1998 dataset : by Jean Roth , jroth@nber.org , 14 Mar 2018 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- zipcode | 0 hsanum | 43,193 26746.28 15052.16 1001 53026 hsacity | 0 hsastate | 0 hrrnum | 43,193 258.3511 122.391 1 457 -------------+--------------------------------------------------------- hrrcity | 0 hrrstate | 0 year | 43,193 1998 0 1998 1998 by Jean Roth , jroth@nber.org , 14 Mar 2018