Frequencies for first 10,000 rows of prov2250 variable in pos1991 dataset :

       srv: |
    nursing |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      5,648       56.48       56.48
          0 |          4        0.04       56.52
          1 |      2,892       28.92       85.44
          2 |         78        0.78       86.22
          3 |         17        0.17       86.39
          4 |      1,292       12.92       99.31
          5 |          1        0.01       99.32
          6 |          2        0.02       99.34
          7 |         66        0.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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