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Slope in Quadratic Regression

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eremlo
 
Reply Mon 20 Feb, 2012 09:13 am
Im trying to figure out of the B in my SPSS output equals to the slope of the quadratic equation. Is it still the slope but just calculated differently from the linear equation?
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Type: Question • Score: 1 • Views: 3,144 • Replies: 2
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High Seas
 
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Reply Mon 20 Feb, 2012 11:04 am
@eremlo,
Your problem is unrelated to the program you're using: SPSS is just a program for data manipulation, it's one of many, and it's not necessarily the best. Your problem is understanding the underlying statistical analysis. Read a good introductory text on descriptive statistics. Here's a link, start on page 301:
http://www.wolfram.com/learningcenter/tutorialcollection/MathematicsAndAlgorithms/MathematicsAndAlgorithms.pdf
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raprap
 
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Reply Sun 26 Feb, 2012 10:40 am
@eremlo,
Quadratics are 2nd order polynomials--

They're of the form ax^2+bx+c=0, where a, b & c are constants

b is not the slope of a quadratic as the slope changes with x---the slope at an specified x is the derivitive at that x (2ax+b)

Rap
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