Characterization and Correction of Bias Due to Nonparticipation and the Degree of Loyalty in Large-Scale Finnish Loyalty Card Data on Grocery Purchases: Cohort Study

Anna-Leena Vuorinen (Corresponding Author), Maijalaiisa Erkkola, Mikael Fogelholm, Satu Kinnunen, Hannu Saarijärvi, Liisa Uusitalo, Turkka Näppilä, Jaakko Nevalainen

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Medicine & Life Sciences