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Bug in StandardScaler #12901

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atolpin opened this issue Jan 2, 2019 · 3 comments
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Bug in StandardScaler #12901

atolpin opened this issue Jan 2, 2019 · 3 comments

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@atolpin
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atolpin commented Jan 2, 2019

You guys seem to be using np.std(x) to scale each column instead of np.std(x, ddof=1). As a result your std estimate is biased. Note that similar function in R, base::scale uses unbiased std estimate.
@jnothman
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jnothman commented Jan 2, 2019

Duplicate of #7757, FWIW.

@atolpin
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atolpin commented Jan 2, 2019 via email

@qinhanmin2014
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Let's discuss in #7757

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@jnothman @atolpin @qinhanmin2014