regression 1

regression 1 - © John M Ackroff 2008 Quantitative Methods...

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Unformatted text preview: © John M. Ackroff 2008 Quantitative Methods Regression I February 28, 2008 © John M. Ackroff 2008 Prediction Suppose a person is 5’11” tall, and the average score on his class’ midterm is 75%. What’s your best estimate of his score? Another member of the class is 6’1” tall. What’s your best estimate of his score on the midterm? © John M. Ackroff 2008 Prediction Suppose someone’s t x is 1.26. What value do you predict for t y ? Now suppose someone’s t x is 1.26 and r xy = 0.82. What value do you predict for t y ? © John M. Ackroff 2008 Prediction To predict Y based on X Where does the person stand in the X distribution? What is Z x or t x ? What is the relationship between X and Y? What is ρ xy or r xy ? © John M. Ackroff 2008 Prediction The farther I am from X, the farther I’ll be from Y. The sign of ρ or r tells the direction The strength tells how far. © John M. Ackroff 2008 Where are our predictions?...
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regression 1 - © John M Ackroff 2008 Quantitative Methods...

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