Frequencies for d3_irf_c2_40 variable in prds_hosp10_yr2010 dataset :

d3_irf_c2_4 |
          0 |      Freq.     Percent        Cum.
------------+-----------------------------------
        248 |          1        0.04        0.04
        294 |          1        0.04        0.09
        780 |          1        0.04        0.13
          . |      2,320       99.87      100.00
------------+-----------------------------------
      Total |      2,323      100.00

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