Frequencies for first 10,000 rows of me_attf variable in natlterr2007 dataset :

  Attempted |
Forceps RFP |
617=f_md_at |
     tfor R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,163       61.63       61.63
          N |      3,810       38.10       99.73
          U |          1        0.01       99.74
          Y |         26        0.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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