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10 cards from this deck
Linear correlation between variables
rrr is a pure number with no units
∑(x−xˉ)(y−yˉ)∑(x−xˉ)2∑(y−yˉ)2\frac{\sum (x-\bar{x})(y-\bar{y})}{\sqrt{\sum(x-\bar{x})^2\sum(y-\bar{y})^2}}∑(x−xˉ)2∑(y−yˉ)2∑(x−xˉ)(y−yˉ)
m=∑(x−xˉ)(y−yˉ)∑(x−xˉ)2m = \frac{\sum (x - \bar{x})(y - \bar{y})}{\sum (x - \bar{x})^2}m=∑(x−xˉ)2∑(x−xˉ)(y−yˉ)
b=yˉ−mxˉb = \bar{y} - m\bar{x}b=yˉ−mxˉ
(xˉ,yˉ)(\bar{x}, \bar{y})(xˉ,yˉ) - the mean point
0.60.60.6 to 1.01.01.0
0.40.40.4 to 0.60.60.6
0.10.10.1 to 0.40.40.4
They are the same: ∑(x−xˉ)(y−yˉ)\sum (x - \bar{x})(y - \bar{y})∑(x−xˉ)(y−yˉ)
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