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All Things Data Science

Istvan Hajnal's musings on Data Science, Big Data, Market Research and Data journalism

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Showing posts from June, 2025

Calibration, weighting and post-stratification in audience measurement

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Read my post on substack: Calibration, weighting and post-stratification in audience measurement

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The opinions expressed here represent my own and not those of my employer

Istvan Hajnal: Leuven, Belgium; Istvan Hajnal is a veteran of more than 30 years in the fields of data analysis, survey methodology and market research. First at the University of Leuven, Belgium and then about 10 years with The Nielsen Company, the world's largest Market Research Company. After a few years as an independent consultant in data science, Istvan became nsights Director, Marketing & Data Sciences for GfK, Belgium. Currently he is insights director for Ipsos, The Netherlands. He received a master's degree in computer science (Leuven), a master's degree in quantitative applications in the social sciences (Brussels) and finally a Phd in Social sciences from the University of Leuven. He blogs about Data Science but occasionally also on management and leadership in general and the Market Research Industry in particular.

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