Frequencies for first 10,000 rows of uop_tocol variable in natl2003 dataset :

  Tocolysis |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         89        0.89        0.89
          2 |      9,145       91.45       92.34
          8 |          5        0.05       92.39
          9 |        761        7.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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