Comparing Data Sources Using Regression Analysis Our regression results for price per cigarette demonstrate that in relation to Nielsen data, Kantar (retail and online) and Nottingham OPD prices showed modest, though in several cases highly significant, differences in price per cigarette or gram of hand-rolling tobacco, with Kantar data tending to be lower and Nottingham OPD data higher than Nielsen figures ( Table 2 ).
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Comparison between Online and Offline Price of Tobacco Products Using Novel Datasets.
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