Frequencies for city variable in pch_cancerspecificmeasures_hospital dataset :

        City |      Freq.     Percent        Cum.
-------------+-----------------------------------
      BOSTON |          2        9.09        9.09
     BUFFALO |          2        9.09       18.18
    COLUMBUS |          2        9.09       27.27
      DUARTE |          2        9.09       36.36
     HOUSTON |          2        9.09       45.45
 LOS ANGELES |          2        9.09       54.55
       MIAMI |          2        9.09       63.64
    NEW YORK |          2        9.09       72.73
PHILADELPHIA |          2        9.09       81.82
     SEATTLE |          2        9.09       90.91
       TAMPA |          2        9.09      100.00
-------------+-----------------------------------
       Total |         22      100.00

by Jean Roth , jroth@nber.org , 16 Nov 2016