Frequencies for d_4_irf_c13_90 variable in prds_hosp10_yr2015 dataset :

d_4_irf_c13 |
        _90 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          2        0.03        0.03
          2 |          2        0.03        0.06
         13 |          1        0.02        0.08
          . |      6,253       99.92      100.00
------------+-----------------------------------
      Total |      6,258      100.00

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