Frequencies for first 10,000 rows of prov5675 variable in pos1997 dataset :

     * srv: |
 blood bank |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,792       87.92       87.92
          0 |        298        2.98       90.90
          1 |        560        5.60       96.50
          2 |        309        3.09       99.59
          3 |         41        0.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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