Frequencies for first 10,000 rows of caseversion variable in demo2012q4 dataset :

     Safety |
     Report |
    Version |
     Number |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         52        0.52        0.52
          2 |      4,667       46.67       47.19
          3 |      2,284       22.84       70.03
          4 |      1,286       12.86       82.89
          5 |        701        7.01       89.90
          6 |        443        4.43       94.33
          7 |        277        2.77       97.10
          8 |        180        1.80       98.90
          9 |        110        1.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Apr 2017