Frequencies for first 10,000 rows of urban variable in nhamcsopd1996 dataset :

 metro/non-metro status of hospital |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
MSA (Metropolitan Statistical Area) |     10,000      100.00      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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