Frequencies for first 10,000 rows of mtran variable in natlterr2014 dataset :

     Mother |
Transferred |
      Y Yes |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,077       10.77       10.77
          N |      8,831       88.31       99.08
          U |         73        0.73       99.81
          Y |         19        0.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016