Frequencies for per_no variable in miper dataset :

     per_no |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        932       98.52       98.52
          2 |         11        1.16       99.68
          3 |          2        0.21       99.89
          4 |          1        0.11      100.00
------------+-----------------------------------
      Total |        946      100.00

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