Frequencies for countyname variable in countymd1989 dataset :

   County Name |      Freq.     Percent        Cum.
---------------+-----------------------------------
      Allegany |          1        4.00        4.00
  Anne Arundel |          1        4.00        8.00
     Baltimore |          1        4.00       12.00
Baltimore city |          1        4.00       16.00
       Calvert |          1        4.00       20.00
      Caroline |          1        4.00       24.00
       Carroll |          1        4.00       28.00
         Cecil |          1        4.00       32.00
       Charles |          1        4.00       36.00
    Dorchester |          1        4.00       40.00
     Frederick |          1        4.00       44.00
       Garrett |          1        4.00       48.00
       Harford |          1        4.00       52.00
        Howard |          1        4.00       56.00
          Kent |          1        4.00       60.00
      MARYLAND |          1        4.00       64.00
    Montgomery |          1        4.00       68.00
 Prince George |          1        4.00       72.00
  Queen Anne's |          1        4.00       76.00
      Somerset |          1        4.00       80.00
    St. Mary's |          1        4.00       84.00
        Talbot |          1        4.00       88.00
    Washington |          1        4.00       92.00
      Wicomico |          1        4.00       96.00
     Worcester |          1        4.00      100.00
---------------+-----------------------------------
         Total |         25      100.00

by Jean Roth , jroth@nber.org , 23 Jun 2017