Frequencies for first 10,000 rows of prov2250 variable in pos1993 dataset :

       srv: |
    nursing |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,638       86.38       86.38
          1 |      1,308       13.08       99.46
          2 |         14        0.14       99.60
          3 |         40        0.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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