Frequencies for first 10,000 rows of prov1520 variable in pos1997 dataset :

        pps |
   previous |
   provider |
     number |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,989       99.89       99.89
     010147 |          1        0.01       99.90
     040125 |          1        0.01       99.91
     050554 |          1        0.01       99.92
     050611 |          1        0.01       99.93
     050628 |          1        0.01       99.94
     050639 |          1        0.01       99.95
     050645 |          1        0.01       99.96
     050655 |          1        0.01       99.97
     052030 |          1        0.01       99.98
     062002 |          1        0.01       99.99
     062003 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016