Frequencies for first 10,000 rows of nrsng_srvc_cd variable in pos2010 dataset :

       SRV: |
    NURSING |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,531       75.31       75.31
          0 |        138        1.38       76.69
          1 |      2,197       21.97       98.66
          2 |         13        0.13       98.79
          3 |        121        1.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017