条目集，在这种情况下是一起购买的符合最低支持度和可信度的产品。
Item Sets, in this case, are products that are purchased together that meet the minimum support and confidence.
同时，推导了空间关联规则的支持度和可信度的变化规律。
At the same time, varying laws of support and confidence are studied while deducing new spatial association rules.
并对关联规则中的增量更新问题进行了分析，提出了在最小支持度和最小可信度都不变的情况下解决方法。
Additionally, the incremental update issues have been discussed and a solution is presented without the change of minimum supporting degree and minimum trust degree.
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