zhengruifeng commented on issue #27982: [SPARK-31222][ML] Make ANOVATest Sparsity-Aware URL: https://github.com/apache/spark/pull/27982#issuecomment-603608126 @srowen @huaxingao Thanks for reviewing! > you are only avoiding counts 0s in sum and sumSq right? not count. Yes, you are right. > Would ANOVA be applied to sparse data regularly? Yes, I think so. It is usual to encounter categorical label and sparse numerical features, such as public dataset `KDD12`.
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