Published on in Vol 22, No 7 (2020): July
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/18059, first published
.
![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 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](https://asset.jmir.pub/assets/120359bf906250e0c55ed27eed000ed8.png 480w,https://asset.jmir.pub/assets/120359bf906250e0c55ed27eed000ed8.png 960w,https://asset.jmir.pub/assets/120359bf906250e0c55ed27eed000ed8.png 1920w,https://asset.jmir.pub/assets/120359bf906250e0c55ed27eed000ed8.png 2500w)
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