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== Statistics == In [[statistics]], the gradient of the [[Least squares regression|least-squares regression]] [[best-fitting line]] for a given [[sample (statistics)|sample]] of data may be written as: :<math>m = \frac{rs_y}{s_x}</math>, This quantity ''m'' is called as the ''[[regression slope]]'' for the line <math>y=mx+c</math>. The quantity <math>r</math> is [[Pearson correlation coefficient|Pearson's correlation coefficient]], <math>s_y</math> is the [[standard deviation]] of the y-values and <math>s_x</math> is the [[standard deviation]] of the x-values. This may also be written as a ratio of [[covariance]]s:<ref>{{Cite book|title=Further Mathematics Units 3&4 VCE (Revised)|publisher=Cambridge Senior Mathematics|year=2016|isbn=9781316616222|via=Physical Copy}}</ref> :<math>m = \frac{\operatorname{cov}(Y,X)}{\operatorname{cov}(X,X)}</math>
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