srowen commented on issue #27982: [SPARK-31222][ML] Make ANOVATest Sparsity-Aware URL: https://github.com/apache/spark/pull/27982#issuecomment-602631796 I think it's probably OK; you are only avoiding counts 0s in sum and sumSq right? not count. Would ANOVA be applied to sparse data regularly? not sure, maybe. Just wondering how important the extra complexity is.
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