Frequencies for first 10,000 rows of esrd_ntwrk_num variable in pos2018 dataset :

       ESRD |
    Network |
     Number |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      9,237       92.37       92.37
         13 |        109        1.09       93.46
         15 |        147        1.47       94.93
         16 |          8        0.08       95.01
         17 |        134        1.34       96.35
         18 |        182        1.82       98.17
          5 |          1        0.01       98.18
          8 |        182        1.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Feb 2019