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Posted to issues-all@impala.apache.org by "Jim Apple (JIRA)" <ji...@apache.org> on 2018/08/11 18:01:00 UTC
[jira] [Work started] (IMPALA-7426) T-test is an unreliable method
for comparing non-normal distributions
[ https://issues.apache.org/jira/browse/IMPALA-7426?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on IMPALA-7426 started by Jim Apple.
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> T-test is an unreliable method for comparing non-normal distributions
> ---------------------------------------------------------------------
>
> Key: IMPALA-7426
> URL: https://issues.apache.org/jira/browse/IMPALA-7426
> Project: IMPALA
> Issue Type: Bug
> Components: Infrastructure
> Reporter: Jim Apple
> Assignee: Jim Apple
> Priority: Major
>
> 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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