Further Correlation & Regression (A Level only) (AQA A-Level Mathematics): Flashcards

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PMCC & Non-linear Regression
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PMCC measures

Strength & direction of linear relationship between two variables

PMCC range

-1 to 1

PMCC value of +1 means

Perfect positive linear correlation

PMCC value of -1 means

Perfect negative linear correlation

PMCC value of 0 means

No linear correlation

Positive rr interpretation

As xx increases, yy also increases

Negative rr interpretation

As xx increases, yy decreases

Meaning of ∣r∣|r| close to 1

Stronger linear relationship

When to use non-linear regression

When relationship between variables is not linear

Quadratic relationship form

y=ax2+bx+cy = ax^2 + bx + c

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Further Correlation & Regression (A Level only)

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Further Correlation & Regression (A Level only)

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Further Correlation & Regression (A Level only)

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