Frequencies for first 10,000 rows of totchron variable in nhamcsopd2011 dataset :

       Total # of |
          chronic |
       conditions |      Freq.     Percent        Cum.
------------------+-----------------------------------
Entire item blank |        164        1.64        1.64
                0 |      4,261       42.61       44.25
                1 |      2,508       25.08       69.33
                2 |      1,310       13.10       82.43
                3 |        879        8.79       91.22
                4 |        487        4.87       96.09
                5 |        233        2.33       98.42
                6 |        100        1.00       99.42
                7 |         36        0.36       99.78
                8 |         18        0.18       99.96
                9 |          3        0.03       99.99
               10 |          1        0.01      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016