Frequencies for first 10,000 rows of per_no variable in miper dataset :

     per_no |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,864       98.64       98.64
          2 |        101        1.01       99.65
          3 |         19        0.19       99.84
          4 |          9        0.09       99.93
          5 |          4        0.04       99.97
          6 |          1        0.01       99.98
         10 |          1        0.01       99.99
         20 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016