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bpo-44151: Various grammar, word order, and markup fixes (GH-26344)

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Raymond Hettinger 2021-05-24 23:04:04 -07:00 • committed by GitHub
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Doc/library/statistics.rst
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@ -643,7 +643,7 @@ However, for reading convenience, most of the examples show sorted sequences.
.. versionadded:: 3.10
.. function:: linear_regression(independent_variable, dependent_variable)
.. function:: linear_regression(x, y, /)
Return the slope and intercept of `simple linear regression
<https://en.wikipedia.org/wiki/Simple_linear_regression>`_
@ -651,30 +651,30 @@ However, for reading convenience, most of the examples show sorted sequences.
regression describes the relationship between an independent variable *x* and
a dependent variable *y* in terms of this linear function:
*y = intercept + slope \* x + noise*
*y = slope \* x + intercept + noise*
where ``slope`` and ``intercept`` are the regression parameters that are
estimated, and noise represents the
estimated, and ``noise`` represents the
variability of the data that was not explained by the linear regression
(it is equal to the difference between predicted and actual values
of dependent variable).
of the dependent variable).
Both inputs must be of the same length (no less than two), and
the independent variable *x* needs not to be constant;
otherwise :exc:`StatisticsError` is raised.
the independent variable *x* cannot be constant;
otherwise a :exc:`StatisticsError` is raised.
For example, we can use the `release dates of the Monty
Python films <https://en.wikipedia.org/wiki/Monty_Python#Films>`_, and used
it to predict the cumulative number of Monty Python films
Python films <https://en.wikipedia.org/wiki/Monty_Python#Films>`_
to predict the cumulative number of Monty Python films
that would have been produced by 2019
assuming that they kept the pace.
assuming that they had kept the pace.
.. doctest::
>>> year = [1971, 1975, 1979, 1982, 1983]
>>> films_total = [1, 2, 3, 4, 5]
>>> slope, intercept = linear_regression(year, films_total)
>>> round(intercept + slope * 2019)
>>> round(slope * 2019 + intercept)
16
.. versionadded:: 3.10