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Standard Deviation formula is wrong

Atemu opened this issue · comments

commented 
    return Math.sqrt(standardDeviation / length);

needs to be

    return Math.sqrt(standardDeviation / length - 1);

Cross-check with Wolframalpha: https://www.wolframalpha.com/input?i=standard+deviation+%2825.0%2C+5.0%2C+45.0%2C+68.0%2C+61.0%2C+46.0%2C+24.0%2C+95.0%29

commented

Hey, @Atemu.

Assuming this article: https://www.baeldung.com/java-calculate-standard-deviation

It uses population standard deviation.

We'll update the article to make this clear.