Frequencies for a7_1_c3_7 variable in prds_hosp10_yr2011 dataset :

  a7_1_c3_7 |      Freq.     Percent        Cum.
------------+-----------------------------------
    1698375 |          1        0.02        0.02
   2.18e+07 |          1        0.02        0.03
          . |      6,148       99.97      100.00
------------+-----------------------------------
      Total |      6,150      100.00

by Jean Roth , jroth@nber.org , 24 Aug 2018