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10 cards from this deck
Linear correlation between variables
rrr is a pure number with no units
โ(xโxห)(yโyห)โ(xโxห)2โ(yโyห)2\frac{\sum (x-\bar{x})(y-\bar{y})}{\sqrt{\sum(x-\bar{x})^2\sum(y-\bar{y})^2}}โ(xโxห)2โ(yโyหโ)2โโ(xโxห)(yโyหโ)โ
m=โ(xโxห)(yโyห)โ(xโxห)2m = \frac{\sum (x - \bar{x})(y - \bar{y})}{\sum (x - \bar{x})^2}m=โ(xโxห)2โ(xโxห)(yโyหโ)โ
b=yหโmxหb = \bar{y} - m\bar{x}b=yหโโmxห
(xห,yห)(\bar{x}, \bar{y})(xห,yหโ) - 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: โ(xโxห)(yโyห)\sum (x - \bar{x})(y - \bar{y})โ(xโxห)(yโyหโ)
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