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Coefficient of determination

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blαh2355:
We have to do this assignment for pre-calc and we have to find the best fit line for some data. The quartic reg was the best fit according to the coefficient of determination but when I pop the equation into the graph, it comes up with crazy numbers. I noticed that it had R-squared as its CoD but some other regs had r-squared. Note that the CoD and equations were found in a calculator.

My question is, is there a difference between r and R?

whagman:
r shows how strong the line is, if it is 1, it is a really strong positive line, -1 is a really strong negative line. 0 is almost no correlation.

r squared turns into a precentage to say like say my r squared is .62, you can find 62% of the data using teh line.


idk what you're talking about though.

blαh2355:

--- Quote from: whagman on October 14, 2012, 03:54:48 PM ---r shows how strong the line is, if it is 1, it is a really strong positive line, -1 is a really strong negative line. 0 is almost no correlation.

r squared turns into a precentage to say like say my r squared is .62, you can find 62% of the data using teh line.


idk what you're talking about though.

--- End quote ---
That's not what I meant. See example pics:

https://www.dropbox.com/s/e9no6jvr7w0p0bp/Screenshot_2012-10-14-19-00-26.jpg

https://www.dropbox.com/s/5zfwzcmzq4b4yxq/Screenshot_2012-10-14-19-00-56.jpg

See how the first one has lowercase r-square and the second one has uppercase R-square?

whagman:
yeah fuck. i know the lowercase r, but not R

coolzeldad:
R might stand for a combination of radii like r1 + r2..... can't remember anything else atm.

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