Frequencies for d_4_irf_c13_91 variable in prds_hosp10_yr2012 dataset :

d_4_irf_c13 |
        _91 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          4        0.06        0.06
          2 |          1        0.02        0.08
          3 |          1        0.02        0.10
          4 |          1        0.02        0.11
          6 |          1        0.02        0.13
          . |      6,219       99.87      100.00
------------+-----------------------------------
      Total |      6,227      100.00

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