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The form of linear function is: y = ax + b. We have to determine a and b coefficients. For example, we have two variables with their values which are displayed in two colunm. The formulate for these coefficients as below: a = sum of [(xi-xaverage)*(yi-yaverage)] / sum of [(xi-xaverage)2] b = a*xaverage - yaverage You need to calculate correlative coefficient r2. The formulate as below: r2 = [(a*SD(xi)/SD(yi)]2 Where: SD - Standard Deviation.

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