Frequencies for s2_18 variable in hcris2552_96_2009 dataset :

      s2_18 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        676       10.90       10.90
          2 |      2,391       38.55       49.45
          3 |         10        0.16       49.61
          4 |      1,361       21.94       71.56
          5 |        149        2.40       73.96
          6 |        212        3.42       77.38
          7 |          5        0.08       77.46
          8 |        118        1.90       79.36
          9 |        478        7.71       87.07
         10 |        284        4.58       91.65
         11 |        348        5.61       97.26
         12 |         78        1.26       98.52
         13 |         92        1.48      100.00
------------+-----------------------------------
      Total |      6,202      100.00

by Jean Roth , jroth@nber.org , 31 Aug 2018