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https://issues.apache.org/jira/browse/MATH-1519?focusedWorklogId=400316&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-400316
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ASF GitHub Bot logged work on MATH-1519:
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Author: ASF GitHub Bot
Created on: 09/Mar/20 18:56
Start Date: 09/Mar/20 18:56
Worklog Time Spent: 10m
Work Description: coveralls commented on issue #123: MATH-1519 Implement
Calinski-Harabasz clusters evaluator.
URL: https://github.com/apache/commons-math/pull/123#issuecomment-596721345
[](https://coveralls.io/builds/29230805)
Coverage increased (+0.008%) to 90.517% when pulling
**d1a8e3c7ff245b0a1704968aa1032fd57ba54827 on
chentao106:Feature_Calinski-Harabasz** into
**aafc49afd764351668045c0fadf2ad6222490ba7 on apache:master**.
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Issue Time Tracking
-------------------
Worklog Id: (was: 400316)
Time Spent: 20m (was: 10m)
> Implement the Calinski-Harabasz clusters evaluator
> --------------------------------------------------
>
> Key: MATH-1519
> URL: https://issues.apache.org/jira/browse/MATH-1519
> Project: Commons Math
> Issue Type: New Feature
> Reporter: Chen Tao
> Priority: Major
> Labels: features
> Time Spent: 20m
> Remaining Estimate: 0h
>
> It is also known as the Variance Ratio Criterion.
> The Calinsk-iHarabasz score is defined as ratio between the within-cluster
> dispersion and the between-cluster dispersion, can be used to evaluate the
> model, where a higher Calinski-Harabasz score relates to a model with better
> defined clusters.
> For more information, please read:
> https://scikit-learn.org/stable/modules/generated/sklearn.metrics.calinski_harabasz_score.html
> https://www.tandfonline.com/doi/abs/10.1080/03610927408827101
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