Mt139C4 - Caution: Correlation and Regression are Only for...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
MT139~4.PPT 1 Caution: Correlation and Regression are Only for Linear Relationships Always Plot Your Data and Residuals to Detect Non-Linearity 40 30 20 50 0 -50 -100 -150 x y R-Sq = 0.004 Y = 16.7972 - 0.494209X Regression Plot r = -0.06
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
MT139~4.PPT 2 Caution: Outliers Can Greatly Affect Correlation and Regression Results Always Plot Your Data and Residuals to Detect Outliers 40 30 20 70 60 50 40 30 x y R-Sq = 0.134 Y = 17.7008 + 0.482838X Regression Plot r = 0.36
Background image of page 2
MT139~4.PPT 3 Caution: Do Not Make Predictions Using x Values Far Outside the Range of the Original Data 50 40 30 20 10 200 150 100 50 x y R-Sq = 0.912 Y = 28.4697 + 3.16325X Regression Plot
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
MT139~4.PPT 4 Caution: Correlations Based on Averages are Usually Too High When Applied to Individuals 3000 2000 1000 1500 1000 500 0 Density Yield r = 0.73 Individual Yields 3000 2000 1000 1500 1000 500 0 Density Average Yield r = 0.96 Average Yields
Background image of page 4
MT139~4.PPT 5 Caution: A Lurking Variable is a Variable That Has an Important Effect on the Relationship Among the Variables in a Study but is Not Included Among the Variables Studied 40 35 30 25 50 40 30 20 10 0 x y R-Sq = 0.211 Y = -32.6877 + 1.78673X Regression Plot
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 06/06/2011 for the course MTH 139 taught by Professor Mikekadar during the Winter '00 term at Moraine Valley Community College.

Page1 / 16

Mt139C4 - Caution: Correlation and Regression are Only for...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online