Summary statistics for ziphsahrr2000 dataset : by Jean Roth , jroth@nber.org , 14 Mar 2018 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- zipcode | 0 hsanum | 43,319 26736.26 15052.06 1001 53026 hsacity | 0 hsastate | 0 hrrnum | 43,319 258.2663 122.3935 1 457 -------------+--------------------------------------------------------- hrrcity | 0 hrrstate | 0 year | 43,319 2000 0 2000 2000 by Jean Roth , jroth@nber.org , 14 Mar 2018