Interesting way to get r (correlation coefficient) - Printable Version +- HP Forums ( https://www.hpmuseum.org/forum)+-- Forum: HP Calculators (and very old HP Computers) ( /forum-3.html)+--- Forum: General Forum ( /forum-4.html)+--- Thread: Interesting way to get r (correlation coefficient) ( /thread-13214.html) |

Interesting way to get r (correlation coefficient) - bshoring - 06-30-2019 10:12 PM
The HP-55 was the first HP handheld to feature full six-register statistical accumulation. As best as I can tell, it wasn't until the HP-27 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 r-squared: 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 HP-55, I tried it on an emulator for an HP-32E. 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. |