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Add zscore to statistics.NormalDist #84470

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rhettinger opened this issue Apr 15, 2020 · 3 comments
Closed

Add zscore to statistics.NormalDist #84470

rhettinger opened this issue Apr 15, 2020 · 3 comments
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3.9 only security fixes stdlib Python modules in the Lib dir type-feature A feature request or enhancement

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BPO 40290
Nosy @rhettinger, @stevendaprano
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  • bpo-40290: Add zscore() to statistics.NormalDist. #19547
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    Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = 'https://github.com/rhettinger'
closed_at = <Date 2020-04-16.17:25:41.221>
created_at = <Date 2020-04-15.03:14:09.048>
labels = ['type-feature', 'library', '3.9']
title = 'Add zscore to statistics.NormalDist'
updated_at = <Date 2020-04-16.17:25:41.221>
user = 'https://github.com/rhettinger'

    bugs.python.org fields:

    activity = <Date 2020-04-16.17:25:41.221>
actor = 'rhettinger'
assignee = 'rhettinger'
closed = True
closed_date = <Date 2020-04-16.17:25:41.221>
closer = 'rhettinger'
components = ['Library (Lib)']
creation = <Date 2020-04-15.03:14:09.048>
creator = 'rhettinger'
dependencies = []
files = []
hgrepos = []
issue_num = 40290
keywords = ['patch']
message_count = 3.0
messages = ['366484', '366571', '366611']
nosy_count = 2.0
nosy_names = ['rhettinger', 'steven.daprano']
pr_nums = ['19547']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue40290'
versions = ['Python 3.9']
    @rhettinger
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    I've had a couple of requests for a z-score method, once to produce an actual z-score for output and another as a way of normalizing gaussian inputs for machine learning.

    Proposed:

        >>> iq = NormalDist(100, 15)
    >>> iq.zscore(142)
    2.8

    Same result as:

        >>> (142 - iq.mean) / iq.stdev
    2.8

    There is some question about whether to name it zscore or z_score. Numpy uses zscore but numpy tends to scrunch names where we would tend to spell them out or use an underscore for readability.

    See: https://en.wikipedia.org/wiki/Standard_score

    @rhettinger rhettinger added the 3.9 only security fixes label Apr 15, 2020
    @rhettinger rhettinger self-assigned this Apr 15, 2020
    @rhettinger rhettinger added stdlib Python modules in the Lib dir type-feature A feature request or enhancement 3.9 only security fixes labels Apr 15, 2020
    @rhettinger rhettinger self-assigned this Apr 15, 2020
    @rhettinger rhettinger added stdlib Python modules in the Lib dir type-feature A feature request or enhancement labels Apr 15, 2020
    @rhettinger
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    Trying out various names in code examples, zscore() was a clear winner over z_score(). Also, the name matches what is used in R and numpy.

    @rhettinger rhettinger changed the title Add z_score to statistics.NormalDist Add zscore to statistics.NormalDist Apr 15, 2020
    @rhettinger rhettinger changed the title Add z_score to statistics.NormalDist Add zscore to statistics.NormalDist Apr 15, 2020
    @rhettinger
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    New changeset 70f027d by Raymond Hettinger in branch 'master':
    bpo-40290: Add zscore() to statistics.NormalDist. (GH-19547)
    70f027d

    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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