Frequencies for zip_code variable in pch_cancerspecificmeasures_hospital datase

   ZIP Code |      Freq.     Percent        Cum.
------------+-----------------------------------
       2115 |          3        9.09        9.09
      10021 |          3        9.09       18.18
      14203 |          3        9.09       27.27
      19111 |          3        9.09       36.36
      33136 |          3        9.09       45.45
      33612 |          3        9.09       54.55
      43210 |          3        9.09       63.64
      77030 |          3        9.09       72.73
      90089 |          3        9.09       81.82
      91010 |          3        9.09       90.91
      98109 |          3        9.09      100.00
------------+-----------------------------------
      Total |         33      100.00

by Jean Roth , jroth@nber.org , 15 Nov 2016