Frequencies for first 10,000 rows of telephon variable in nhamcsopd2000 dataset :

  telephone |
  follow-up |
    planned |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,845       98.45       98.45
          1 |        155        1.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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