Frequencies for s2_18 variable in hcris2552_96_2005 dataset :

      s2_18 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        695       11.12       11.12
          2 |      2,463       39.42       50.54
          3 |          8        0.13       50.67
          4 |      1,332       21.32       71.99
          5 |        127        2.03       74.02
          6 |        167        2.67       76.70
          7 |         10        0.16       76.86
          8 |        129        2.06       78.92
          9 |        512        8.19       87.12
         10 |        296        4.74       91.85
         11 |        367        5.87       97.73
         12 |         88        1.41       99.14
         13 |         54        0.86      100.00
------------+-----------------------------------
      Total |      6,248      100.00

by Jean Roth , jroth@nber.org , 9 Sep 2018