Frequencies for first 10,000 rows of nrsng_srvc_cd variable in pos2013 dataset 

 Nrsng Srvc |
         Cd |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      7,946       79.46       79.46
          1 |      1,953       19.53       98.99
          2 |         12        0.12       99.11
          3 |         89        0.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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