Logarithmic Regression: Different correlation from 3 different calculators

[groundbeef]

(06-09-2015 10:00 PM)Dave Britten Wrote:  1. Evaluate r (from the Catalog) in Run mode.

That's what I missed. I did LogReg, and it just gave me the same screen as stats mode.

(06-09-2015 10:00 PM)Dave Britten Wrote:  With that method, the Casio gives me 0.968372745386438, even more digits than the TI or HP.

Mine too.

I have a TI-84 Plus I can try for giggles.

I went through the computation in steps with excel, so I could see intermediate results. Most of the numbers involved in sums span about 3 orders of magnitude. 4 in a couple of cases. But it looks like you lose more digits than that. The spreadsheet gives 0.968372745386560.


I get .968516807361777 for a linear regression (casio). Comparing that might point toward or away from the log calculation.