Frequencies for first 10,000 rows of ume_forcep variable in natl2011 dataset :

Forceps RFP |
734=f_u_for |
    cep U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         50        0.50        0.50
          2 |      9,168       91.68       92.18
          9 |        782        7.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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