Frequencies for d_4_hos_c4_90 variable in prds_hosp10_yr2013 dataset :

d_4_hos_c4_ |
         90 |      Freq.     Percent        Cum.
------------+-----------------------------------
     280811 |          1        0.02        0.02
     378049 |          1        0.02        0.03
     437571 |          1        0.02        0.05
     531129 |          1        0.02        0.06
          . |      6,244       99.94      100.00
------------+-----------------------------------
      Total |      6,248      100.00

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