Frequencies for first 10,000 rows of nrsng_srvc_cd variable in pos2009 dataset :

       SRV: |
    NURSING |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,425       74.25       74.25
          0 |        138        1.38       75.63
          1 |      2,290       22.90       98.53
          2 |         13        0.13       98.66
          3 |        134        1.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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