Frequencies for first 10,000 rows of uop_monit variable in natlterr2005 dataset :

 Electronic |
      Fetal |
 Monitoring |
          U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,853       38.53       38.53
          2 |        619        6.19       44.72
          9 |      1,783       17.83       62.55
          . |      3,745       37.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015