Frequencies for s3_1_c17_3 variable in snf_rollup2540_96_1995 dataset :

 s3_1_c17_3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |          1        0.08        0.08
          4 |          1        0.08        0.16
         20 |          1        0.08        0.24
        129 |          1        0.08        0.32
          . |      1,231       99.68      100.00
------------+-----------------------------------
      Total |      1,235      100.00

by Jean Roth , jroth@nber.org , 17 Feb 2018