Frequencies for first 10,000 rows of ume_forcep variable in linkpe2009psden dataset :

Forceps U;R |
(f_u_forcep |
  rep flag) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         44        0.44        0.44
          2 |      9,904       99.04       99.48
          9 |         52        0.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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