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

     per_no |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,903       99.03       99.03
          2 |         83        0.83       99.86
          3 |          9        0.09       99.95
          5 |          1        0.01       99.96
          8 |          2        0.02       99.98
         19 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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