Frequencies for s2_18 variable in hcris2552_96_2004 dataset :

      s2_18 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        705       11.25       11.25
          2 |      2,474       39.49       50.74
          3 |         11        0.18       50.92
          4 |      1,358       21.68       72.59
          5 |        115        1.84       74.43
          6 |        149        2.38       76.81
          7 |          6        0.10       76.90
          8 |        129        2.06       78.96
          9 |        511        8.16       87.12
         10 |        288        4.60       91.72
         11 |        377        6.02       97.73
         12 |         85        1.36       99.09
         13 |         57        0.91      100.00
------------+-----------------------------------
      Total |      6,265      100.00

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