Frequencies for first 10,000 rows of nrsng_srvc_cd variable in pos2012 dataset 

   Service: |
    Nursing |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      7,976       79.76       79.76
          0 |        140        1.40       81.16
          1 |      1,802       18.02       99.18
          2 |          8        0.08       99.26
          3 |         74        0.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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