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Gerald Goodhardt (born 1930) is a marketing scientist. Apart from being the Chairman of the Board at the (Ehrenberg-Bass Institute for Marketing Science ), Professor Gerald Goodhardt is Emeritus Professor, City University; Visiting Professor, Kingston University and also a Visiting Research Associate, South Bank University. Formerly Sir John E Cohen Professor of Consumer Studies, and Dean of the City University Business School, Gerald has spent 20 years in industry and commerce prior to 20 years as an academic. He has served as Chairman of the Market Research Society (Gold Medalist in 1969 and 1996) and as Hon. Secretary of the Royal Statistical Society. Gerald was also Founding President of the Market Research Benevolent Association. Published extensively in marketing and statistical journals, mainly in quantitative aspects of consumer behaviour and the audience's use of broadcast media. Professor Goodhardt began his career working as a statistician for Attwood Panels, and later Aske Research with Andrew Ehrenberg. From 1981-95 he was Sir John E Cohen Professor of Consumer Studies at The City University Business School. In the early 1980s, with Andrew Ehrenberg and Chris Chatfield, he extended the NBD model to account for brand choices. Finally published in 1984〔Goodhardt, Gerald J., Andrew S.C. Ehrenberg, and Christopher Chatfield (1984), "The Dirichlet: A Comprehensive Model of Buying Behaviour," Journal of the Royal Statistical Society, 147 (part 5), 621-55.〕 the NBD-Dirichlet model of brand choice successfully modeled the repeated category and brand purchases within a wide variety of markets. 'The Dirichlet', as it became known, accounts for a number of empirical generalisations, including Double Jeopardy, the Duplication of Purchase law, and Natural Monopoly.〔Ehrenberg, Andrew S.C., Mark D. Uncles, and Gerald G. Goodhardt (2004), "Understanding Brand Performance Measures: Using Dirichlet Benchmarks," Journal of Business Research, 57 (12), 1307-25.〕 It has been shown to hold over different product categories, countries, time, and for both subscription and repertoire repeat-purchase markets.〔Sharp, Byron, Malcolm Wright, and Gerald Goodhardt (2002), "Purchase loyalty is polarised into either repertoire or subscription patterns," ''Australasian Marketing Journal'', 10 (3), 7.〕 It has been described as one of the most famous empirical generalisations in marketing. Independently and at about the same time, Schmittlein, Bemmaor and Morrison〔Schmittlein, D. C., A. C. Bemmaor and D. G. Morrison (1985) "Why Does the NBD Model Work? Robustness in Representing Product Purchases, Brand Purchases and Imperfectly Recorded Purchases," Marketing Science, Vol. 4, No. 3, 255-266. 〕 published the same model in Marketing Science and showed a variety of its statistical properties, in particular when it reduces to the simple NBD model. They labelled the univariate model as Beta Binomial/Negative Binomial Distribution (BB/NBD). The model has since been extensively applied both by academics and marketing research consultancy firms. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gerald Goodhardt」の詳細全文を読む スポンサード リンク
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