Frequencies for g_c1thr4_20 variable in hosp_rollup2552_96_2011 dataset :

g_c1thr4_20 |      Freq.     Percent        Cum.
------------+-----------------------------------
     482714 |          2        6.90        6.90
    1217318 |          1        3.45       10.34
   1.80e+07 |          1        3.45       13.79
          . |         25       86.21      100.00
------------+-----------------------------------
      Total |         29      100.00

by Jean Roth , jroth@nber.org , 21 Apr 2018