Frequencies for first 10,000 rows of prov3455 variable in pos2009 dataset :

SRV: MENTAL |
HEALTH-ONSI |
   TE-RESID |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,657       76.57       76.57
          N |      1,062       10.62       87.19
          Y |      1,281       12.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016