Frequencies for first 10,000 rows of npnmw variable in namcs2004 dataset :

      nurse |
pract/midwi |
    fe seen |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,951       99.51       99.51
          1 |         49        0.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016