Frequencies for first 10,000 rows of mod_year variable in person dataset :

 MODEL YEAR |      Freq.     Percent        Cum.
------------+-----------------------------------
         34 |          1        0.01        0.01
         46 |          1        0.01        0.02
         47 |          1        0.01        0.03
         48 |          1        0.01        0.04
         50 |          6        0.06        0.10
         51 |          1        0.01        0.11
         53 |          5        0.05        0.16
         54 |          2        0.02        0.18
         55 |          6        0.06        0.24
         57 |          4        0.04        0.28
         58 |          2        0.02        0.30
         59 |          1        0.01        0.31
         60 |          3        0.03        0.34
         61 |          4        0.04        0.38
         62 |          3        0.03        0.41
         63 |         12        0.12        0.53
         64 |         33        0.33        0.86
         65 |         29        0.29        1.15
         66 |         26        0.26        1.41
         67 |         20        0.20        1.61
         68 |         32        0.32        1.93
         69 |         52        0.52        2.45
         70 |         78        0.78        3.23
         71 |         53        0.53        3.76
         72 |         89        0.89        4.65
         73 |         89        0.89        5.54
         74 |         98        0.98        6.52
         75 |         79        0.79        7.31
         76 |        192        1.92        9.23
         77 |        241        2.41       11.64
         78 |        287        2.87       14.51
         79 |        370        3.70       18.21
         80 |        276        2.76       20.97
         81 |        308        3.08       24.05
         82 |        339        3.39       27.44
         83 |        368        3.68       31.12
         84 |        536        5.36       36.48
         85 |        513        5.13       41.61
         86 |        631        6.31       47.92
         87 |        595        5.95       53.87
         88 |        660        6.60       60.47
         89 |        690        6.90       67.37
         90 |        582        5.82       73.19
         91 |        593        5.93       79.12
         92 |        581        5.81       84.93
         93 |        494        4.94       89.87
         94 |         31        0.31       90.18
         99 |        148        1.48       91.66
          . |        834        8.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016