Re: spark-itemsimilarity question: what's the difference between indicator-matrix and cross-indicator-matrix

The terms main and secondary are a bit confusing. The easiest definition is that cooccurrence analyzes the record of actions you want to recommend. Cross occurrence tries to transfer from one behavior to another. In practice, it has been common to conflate many behaviors into one precisely

spark-itemsimilarity question: what's the difference between indicator-matrix and cross-indicator-matrix

May I say indicator-matrix is for the main action for example purchase and the cross-indicator-matrix is for the secondary action? Thanks a lot, Kevin