While considerable research has been done on random-digit-dialing telephone sampling techniques, less research has been done on various techniques for weighting telephone survey data to obtain national estimates (see, for example, Cannel and Groves [i]). During 1980 the National Center for Health Statistics (NCHS) conducted in the conterminous U.S. a random-digit-dialed telephone survey on smoking- and health-related characteristics--the National Telephone Health Interview Survey (NTHIS). Even though data were collected from only the population having a telephone in their 

household, estimates were desired for the entire civilian noninstitutionalized population in the U.S., including that portion of the population without a telephone in their household. The adjustments proposed to accomplish this obiective are examined in this paper. The NCHS also added to the 1980 National Health Interview Survey (NHIS) a Smoking Supplement, which by design employed a data collection instrument congruent to the one employed in the NTHIS. The NHIS is a household interview survey that employs a face-to-face data collection mode. The first part of this paper describes the NTHIS sampling plan. Then, the fully adjusted NTHIS weighting and several alternative weighting schemes are described. Corresponding estimates based on these schemes are compared. These estimates are then compared with corresponding estimates based on the NHIS. Finally, a summary is presented.