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Logarithmic Regression: Different correlation from 3 different calculators
06-09-2015, 10:53 PM
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RE: Logarithmic Regression: Different correlation from 3 different calculators
(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.
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RE: Logarithmic Regression: Different correlation from 3 different calculators - groundbeef - 06-09-2015 10:53 PM



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