Frequencies for first 10,000 rows of prov2250 variable in pos2001 dataset :

       srv: |
    nursing |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,124       81.24       81.24
          1 |      1,754       17.54       98.78
          2 |         13        0.13       98.91
          3 |        109        1.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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