Frequencies for first 10,000 rows of prov2250 variable in pos2004 dataset :

       srv: |
    nursing |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,732       77.32       77.32
          0 |        131        1.31       78.63
          1 |      1,983       19.83       98.46
          2 |         13        0.13       98.59
          3 |        141        1.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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