Frequencies for first 10,000 rows of ume_forcep variable in natl2013 dataset :

Forceps RFP |
734=f_u_for |
    cep U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         69        0.69        0.69
          2 |      9,926       99.26       99.95
          9 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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