Summary statistics for demo2007q4 dataset : by Jean Roth , jroth@nber.org , 18 Dec 2015 Variable | Obs Mean Std. Dev. Min Max -------------+-------------------------------------------------------- primaryid | 109892 5529605 32739.86 5378178 5625752 caseid | 109892 6453394 153907.7 3113907 6605933 i_f_code | 0 i_f_code_num | 109892 71.40147 .9158777 70 72 foll_seq | 0 -------------+-------------------------------------------------------- image | 0 event_dt | 78653 2.01e+07 42033.97 1.01e+07 2.01e+07 event_dt_num | 78653 17071.58 1546.263 -347822 17530 mfr_dt | 103800 2.01e+07 3747.16 1.98e+07 2.01e+07 mfr_dt_num | 103800 17401.42 155.0088 8384 17553 -------------+-------------------------------------------------------- fda_dt | 109892 2.01e+07 82.51971 2.01e+07 2.01e+07 fda_dt_num | 109892 17489.74 25.70877 17349 17531 rept_cod | 0 rept_cod_num | 109892 739480.2 53071.26 687382 806982 mfr_num | 0 -------------+-------------------------------------------------------- mfr_sndr | 0 age | 54528 222.1773 1987.017 -1 35938 age_cod | 0 sex | 0 e_sub | 0 -------------+-------------------------------------------------------- wt | 31358 90.18159 98.37797 0 9545 wt_cod | 0 rept_dt | 109876 2.01e+07 580.0509 2.00e+07 2.01e+07 rept_dt_num | 109876 17484.53 37.38463 14610 17533 occp_cod | 0 -------------+-------------------------------------------------------- death_dt | 6550 2.01e+07 20273.19 1.93e+07 2.01e+07 to_mfr | 0 confid | 0 reporter_c~y | 0 occp_cod_num | 95362 7335.477 545.1169 6778 8072 by Jean Roth , jroth@nber.org , 18 Dec 2015