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

     per_no |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,853       98.53       98.53
          2 |        115        1.15       99.68
          3 |         22        0.22       99.90
          4 |          7        0.07       99.97
          5 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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