Frequencies for first 10,000 rows of chow_sw variable in pos2017 dataset :

       CHOW |
  Indicator |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,003       90.03       90.03
          N |        961        9.61       99.64
          Y |         36        0.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 9 Jan 2018