Trend unit tests#1907

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MarkBaker wants to merge 20 commits intomasterfrom

Trend-Unit-Tests

Commits on Mar 4, 2021

- Move TREND() functions into the Statistical Trends class
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PHPCS
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Keep Scrutinizer happy
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Make Scrutinizer even happier
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Deprecate the old CONFIDENCE() method
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Additional test case for TREND()
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Unit tests from Shared Trend classes
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Merge branch 'master' into Trend-Unit-Tests
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Commits on Mar 5, 2021

Unit tests from Shared Trend classes
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Minor typing improvements
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Commits on Mar 6, 2021

Some minor refactoring
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More unit tests
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PHPCS
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PHPCS
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Minor typing improvements
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Commits on Mar 7, 2021

Improvements to BestFit
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Merge branch 'master' into Trend-Unit-Tests
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Resolve merge conflicts
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Some refactoring of BestFit class
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Some refactoring of BestFit class
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