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

                         Were any |
screening/diagnostic/non-medicati |
 on treatment services ordered or |
                            provi |      Freq.     Percent        Cum.
----------------------------------+-----------------------------------
        No services were reported |        430        4.30        4.30
At least one service was reported |      9,570       95.70      100.00
----------------------------------+-----------------------------------
                            Total |     10,000      100.00

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