Summary statistics for cola_acrdtd_y_match_dt variable in posclia2011 dataset : Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- cola_acrdt~t | 6,725 2.00e+07 66435.01 1.99e+07 2.01e+07 by Jean Roth , jroth@nber.org , 26 Jan 2016