(15C) Multiple Linear Regression for HP-15C

[Thomas Klemm]

(01-27-2014 11:57 AM)Namir Wrote:  What is the size limit on using matrices in the 15C do to multiple regression?

15. But you have to calculate D first, then delete B (DIM 0,0) and only then calculate C and E. My emulator on the iPhone sucks: it will just crash when I try to create a matrix that uses all 64 registers. So I can't tell you what happens when you try with 16 on the real thing.

If you want to avoid entering the data twice you could use \(\sum{+}\) to calculate \(n\), \(\sum{X}\), \(\sum{X^2}\), \(\sum{Z}\), \(\sum{Z^2}\) and \(\sum{XZ}\). In addition to that you have to calculate \(\sum{Y}\), \(\sum{XY}\) and \(\sum{ZY}\) separately.

Cheers
Thomas