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

 MODEL YEAR |      Freq.     Percent        Cum.
------------+-----------------------------------
         38 |          2        0.02        0.02
         53 |          2        0.02        0.04
         54 |          1        0.01        0.05
         55 |          1        0.01        0.06
         56 |          1        0.01        0.07
         57 |          4        0.04        0.11
         58 |          4        0.04        0.15
         59 |          2        0.02        0.17
         60 |          5        0.05        0.22
         61 |          3        0.03        0.25
         62 |         12        0.12        0.37
         63 |          5        0.05        0.42
         64 |         14        0.14        0.56
         65 |         27        0.27        0.83
         66 |         17        0.17        1.00
         67 |         33        0.33        1.33
         68 |         49        0.49        1.82
         69 |         77        0.77        2.59
         70 |         53        0.53        3.12
         71 |         53        0.53        3.65
         72 |         61        0.61        4.26
         73 |         85        0.85        5.11
         74 |         99        0.99        6.10
         75 |         82        0.82        6.92
         76 |        125        1.25        8.17
         77 |        218        2.18       10.35
         78 |        260        2.60       12.95
         79 |        275        2.75       15.70
         80 |        275        2.75       18.45
         81 |        239        2.39       20.84
         82 |        305        3.05       23.89
         83 |        332        3.32       27.21
         84 |        489        4.89       32.10
         85 |        615        6.15       38.25
         86 |        571        5.71       43.96
         87 |        530        5.30       49.26
         88 |        626        6.26       55.52
         89 |        661        6.61       62.13
         90 |        531        5.31       67.44
         91 |        564        5.64       73.08
         92 |        557        5.57       78.65
         93 |        667        6.67       85.32
         94 |        475        4.75       90.07
         95 |         27        0.27       90.34
         99 |        206        2.06       92.40
          . |        760        7.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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