what is the problem with a time aggregation dataset? how to model for interacting pairs time aggregation definition why is the time aggregation problem in ecstat how do you model interaction and unbalanced data? what is a typical problem with a multi-factor data set what is the main effect of time on interactions? what is the design of time and factor interaction what is the problem when the data is aggregated on a continuous response, a time-invariant factor, or a repeatable observation how to understand the interaction on a time period dataset why is a continuous period data unbalanced what type of data can be aggregated on two disjoint time spans and be observed in multiple events? what is the problem with an unbalanced aggregation dataset why are the aggregator data extremely unbalanced why is the time aggregation a problem why is the data aggregated in a multi-time period dataset why is the aggregation problem unbalanced can we aggregate temporal data why the relationship between time and factor is complex types of pairs interactions in a time period