Interesting way to get r (correlation coefficient)

06302019, 10:12 PM
Post: #1




Interesting way to get r (correlation coefficient)
The HP55 was the first HP handheld to feature full sixregister statistical accumulation. As best as I can tell, it wasn't until the HP27 came out that this became standard.
Oddly, there is no "r" function on the 55. The manual does give a short method on page 61 of the manual to get r and rsquared: f L.R. Enter g s (standard dev) / / (this gives you r, though it is not mentioned in the book) g x^2 (this gives you Coefficient of Determination) On some calculators, you might have to insert an x<>y after L.R. Since I don't own an HP55, I tried it on an emulator for an HP32E. With the x<>y after L.R. it works and this method for r perfectly matched the built in function. Perhaps experts may be familiar with this method, but it was a new one to me. Regards, Bob 

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