Frequencies for s2_18 variable in hcris2552_96_2008 dataset :

      s2_18 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        674       10.86       10.86
          2 |      2,403       38.71       49.57
          3 |         14        0.23       49.79
          4 |      1,372       22.10       71.89
          5 |        144        2.32       74.21
          6 |        183        2.95       77.16
          7 |          7        0.11       77.27
          8 |        127        2.05       79.32
          9 |        480        7.73       87.05
         10 |        285        4.59       91.64
         11 |        357        5.75       97.39
         12 |         83        1.34       98.73
         13 |         79        1.27      100.00
------------+-----------------------------------
      Total |      6,208      100.00

by Jean Roth , jroth@nber.org , 12 Sep 2018