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Data from omnibus surveys are analyzed for the purpose of studying the effects of substitution in telephone surveys. Substitutions occur at two selection stages here: first in the selection of telephone numbers, second in the selection of household respondents. For both stages, sample distributions of demographic and socio-economic characteristics are compared with official statistics. Disparities indicate the presence of a substitution bias due to a relatively low response rate. A major portion of the study focuses on the second sampling stage. In a follow-up study, substitutes within households are compared with the persons originally selected for interview.

Substitution in Telephone Surveys Some Empirical Results / Substitutionen in Telefon-Erhebungen Einige empirische Ergebnisse