The Diffusion of Innovations: A Methodological Reappraisal
AbstractStudies of diffusion have traditionally relied on specific distributions-primarily the logistic- to characterize and estimate those processes.We argue here that such approach gives rise to serious problems of comparability and interpretation, and may result in large biases inthe estimates of the parameters of interest. We propose instead the Gini's expected mean differenceas ameasure of diffusion speed, discuss its advantages over the traditional approach, and tackle with it the problems of truncated processes, inter-group comparisons, and related issues. We also elaborateon the use of the hazardrate, and suggest some possible extensions. The diffusion of CT scanners is presented as an illustration.
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Bibliographic InfoArticle provided by American Statistical Association in its journal Journal of Business and Economic Statistics.
Volume (Year): 7 (1989)
Issue (Month): 1 (January)
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Other versions of this item:
- Manuel Trajtenberg & Shlomo Yitzhaki, 1982. "The Diffusion of Innovations: A Methodological Reappraisal," NBER Working Papers 1008, National Bureau of Economic Research, Inc.
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
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"The sales effect of word of mouth: a model for creative goods and estimates for novels,"
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