Frequencies for first 10,000 rows of prov2475 variable in pos2006 dataset :

srv: trauma |
     center |
(certified) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,710       87.10       87.10
          0 |      1,191       11.91       99.01
          1 |         68        0.68       99.69
          2 |         22        0.22       99.91
          3 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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