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

     per_no |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,881       98.81       98.81
          2 |         83        0.83       99.64
          3 |         20        0.20       99.84
          4 |         11        0.11       99.95
          5 |          4        0.04       99.99
          6 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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