Frequencies for first 10,000 rows of prov2250 variable in pos1999 dataset :

       srv: |
    nursing |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,137       81.37       81.37
          1 |      1,748       17.48       98.85
          2 |         14        0.14       98.99
          3 |        101        1.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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