Frequencies for first 10,000 rows of chow_sw variable in pos2018 dataset :

       CHOW |
  Indicator |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,921       89.21       89.21
          N |      1,039       10.39       99.60
          Y |         40        0.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Feb 2019