When excavating with parallel association rules, the two data distribution characters, data skewness and workload balance, will affect the validity of pruning.

在进行并行关联规则挖掘时，数据偏斜和工作量平衡这两个数据分布特征影响着剪枝的有效性。

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Because observational studies have provided misleading evidence for other antioxidants, the validity of this association is uncertain.

由于观察性研究为其他的抗氧化物提供了误导性证据，所以这种联系的可靠性还不明确。

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David Thompson, executive director of the North Carolina Association of County Commissioners, questioned the validity of the study, saying traffic fines in the state go to support schools not county coffers.

WSJ: A Question of Law and Order

The most striking part of the bill was that school districts, rather than the Florida High School Athletic Association, would get more power in determining the validity of transfers, which could occur without students sitting out a predetermined amount of time.

FORBES: High School Sports Free Agency Won't Be Coming To Florida After All