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New Evidence on Using Expert Ratings to Proxy for Wine Quality in Climate Change Research

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This paper provides new evidence on the validity of using product-level expert winescoring data as a proxy for wine quality in climate change research, using nearly 15,000 Bob Campbell ratings of New Zealand wines from 2002 to 2016. We examine two to three regression models for each of the seven most prominent varieties in New Zealand, each with 8-12 treatments. We look for a positive, concave relationship between the expert score and the growing season temperature that gives an optimal temperature value that is plausible given research from other countries. We find mixed results – only 56% of our results are consistent with expectation and give a plausible optimal temperature and 27% are also significant. However, when we “collapse” the data by region, variety and year, essentially constructing vintage scores from our product-level data, we find that all results are consistent with expectation and plausible and 53% are statistically significant despite the sample size after collapsing becoming very small. We conclude that there is great potential in using vintage data constructed from expert-rating data for individual wines for climate change research.

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  • Amogh Prakasha Kumar & Richard Watt & Laura Meriluoto, 2021. "New Evidence on Using Expert Ratings to Proxy for Wine Quality in Climate Change Research," Working Papers in Economics 21/10, University of Canterbury, Department of Economics and Finance.
    • Handle: RePEc:cbt:econwp:21/10
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    File URL: https://repec.canterbury.ac.nz/cbt/econwp/2110.pdf
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    More about this item

    Keywords

    Weather; climate change; wine score; wine quality;
    All these keywords.

    JEL classification:

    • C32 - Mathematical and Quantitative Methods - - Multiple or Simultaneous Equation Models; Multiple Variables - - - Time-Series Models; Dynamic Quantile Regressions; Dynamic Treatment Effect Models; Diffusion Processes; State Space Models
    • Q54 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Environmental Economics - - - Climate; Natural Disasters and their Management; Global Warming

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