Summary statistics for sf12000zcta5centroid dataset : by Jean Roth , jroth@nber.org , 17 Apr 2017 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- zcta5 | 0 intptlat | 33,178 38.83039 5.359397 17.96223 71.29953 intptlon | 33,178 -91.08434 15.07069 -176.6368 -65.29257 by Jean Roth , jroth@nber.org , 17 Apr 2017