The effort of data mining, especially in relation to association rules in real world business applications, is significantly important. Recently, association rules algorithms have been developed to cope with multidimensional data. In this paper we are concerned with mining association rules in data warehouses by focusing on its measurement of summarized data. We propose two algorithms: HAvg and VAvg, to provide the initialization data for mining association rules in data warehouses by concentrating on the measurement of aggregate data. These algorithms are capable of providing efficient initialized data extraction from data warehouses and are used for mining association rules in data warehouses.