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

  telephone |
   followup |
    planned |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,574       95.74       95.74
          1 |        426        4.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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