Frequencies for d_4_hos_c2_55 variable in prds_hosp10_yr2010 dataset :

d_4_hos_c2_ |
         55 |      Freq.     Percent        Cum.
------------+-----------------------------------
        352 |          1        0.04        0.04
       1143 |          1        0.04        0.09
       3978 |          1        0.04        0.13
      18791 |          1        0.04        0.17
          . |      2,319       99.83      100.00
------------+-----------------------------------
      Total |      2,323      100.00

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