Frequencies for d_4_irf_c11_75 variable in prds_hosp10_yr2010 dataset :

d_4_irf_c11 |
        _75 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          2        0.09        0.09
          2 |          2        0.09        0.17
          9 |          1        0.04        0.22
         18 |          1        0.04        0.26
          . |      2,317       99.74      100.00
------------+-----------------------------------
      Total |      2,323      100.00

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