what are non users used for what data properties is available in this research? how to reduce bias and improve recommendation quality how to determine the user's relationship to other users knn data model how to determine the relationship between products and non users how to calculate nonuser data when the average interaction scores for a product are computed and what does this mean? different ways to find similar product interaction what is the method used in a data recommender what data properties include user interaction data? what measures the quality of the product interaction? how to determine the product interaction average user interaction score what is a product interaction test how to calculate product interaction score what is the basic property of data what is the data properties of a product how should we measure interaction of users what are the data properties of a product