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

   Meconium |
        U;R |
(f_uld_meco |
  rep flag) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        172        1.72        1.72
          2 |      9,776       97.76       99.48
          9 |         52        0.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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