Frequencies for first 10,000 rows of ip_chlam variable in natl2013 dataset :

  Chlamydia |
598=f_ip_ch |
      lam R |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |      9,551       95.51       95.51
          U |        222        2.22       97.73
          Y |        227        2.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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