Frequencies for first 10,000 rows of prov2250 variable in pos1995 dataset :

       srv: |
    nursing |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,463       84.63       84.63
          1 |      1,465       14.65       99.28
          2 |         12        0.12       99.40
          3 |         60        0.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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