Frequencies for first 10,000 rows of npnmw variable in namcs2001 dataset :

      nurse |
pract/midwi |
    fe seen |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,926       99.26       99.26
          1 |         74        0.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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