COMM 291 Lecture 7: COMM 291 201 - Regression
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Regress moving back to the middle aka settling bi. + b , where r correlation bo y - axis intercept slope of regression line. D ooo so so is actually line of symmetry o. Draw rectangle where each side is tangent to the circle. For each value of x the average value of the y . regression line goes through. Regression to the mean or ( regression effect ) 72 . on the first test will on average show some improvement on the second test. The top group will on average fall bade . b. Fallacy thinking that the regression effect must be due to bo. 35 something important not just the spread around the line . yn bot bi (x ) E i r2 that the fraction variable explained bythe x . Is or percent of variation in the y - variable. Fi and plot them on vertical axis versus x. Other patterns indicate potential problems : curvature ei.
