10-29-08 - EXACT SAME QUESTION o How much of the variance...

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Psychology 206 – Class Notes – 10/29/08 TODAY : Exercise #19 Regression analysis 11:00 office hours cancelled For Friday : Finish chapter 11 Do exercise #20 November 5 th – Exam #2 EXERCISE #20 – Extension on Regression NEW INFORMATION ABOUT REGRESSION How well does the regression equation (Y’ = a + b*X ) predict the actual values of Y? o Different ways of asking the same question: How accurate is the regression equation? How well does the least-squares regression line fit the data? A MORE FORMAL, STATISTICAL WAY OF ASKING THE
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Unformatted text preview: EXACT SAME QUESTION o How much of the variance in Y is accounted for by the variance in X? Y = (My) + (Y My) + (Y Y) Y = (overall level) + (predicted value) + (unpredictable part) How much of the variance in Y is accounted for by the variance in X? How does the predictable part compare to the unpredictable part? The ratio to demonstrate how the two parts compare : [ (predictable) / (predictable + unpredictable) ]...
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