particular reference to the issues of substitution bias and choice of aggregation dimensions. The potential costs and benefits of ….An Australian scanner data set is used to estimate substitution bias for six different aggregation methods and for fixed base and … sensitive to both the method of aggregation used and whether direct or chained indexes were used. The ILO (2004) recommends the …

Model induction from relational data requires aggregation of values ofattributes of related entities. This paper makes … needed to learn these concepts. (2) Expanding onelevel of the hierarchy, it introduces new aggregation operators thatmodel … byclass. (3) It demonstrates empirically on a noisy business domain thatmore-complex aggregation methods can increase …

still remains significant at high levels of aggregation. Because the bias rises with disaggregation, findings of …