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

• Main Authors: Vuorinen, Anna-Leena (Author), Erkkola, Maijaliisa (Author), Fogelholm, Mikael (Author), Kinnunen, Satu (Author), Saarijärvi, Hannu (Author), Uusitalo, Liisa (Author), Näppilä, Turkka (Author), Nevalainen, Jaakko (Author)
• Format: Book
• Published: JMIR Publications, 2020-07-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.

BackgroundTo date, the evaluation of diet has mostly been based on questionnaires and diaries that have their limitations in terms of being time and resource intensive, and a tendency toward social desirability. Loyalty card data obtained in retailing provides timely and objective information on die...