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  1. IMPALA
  2. IMPALA-7426

T-test is an unreliable method for comparing non-normal distributions

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Details

    • Bug
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • None
    • Impala 3.1.0
    • Infrastructure
    • None
    • ghx-label-3

    Description

      https://en.wikipedia.org/wiki/Student%27s_t-test is for normally distributed variables, and many Impala benchmarks won't be formally distributed. In particular, none of them will have negative run times.

      We should consider https://en.wikipedia.org/wiki/Nonparametric_statistics like https://en.wikipedia.org/wiki/Mann%E2%80%93Whitney_U_test#Comparison_to_Student's_t-test in report_benchmark_results.py.

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            jbapple Jim Apple
            jbapple Jim Apple
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