HP 48G Linear Regression Best Fit Line

[Rodger Rosenbaum]

(12-19-2021 10:39 PM)MNH Wrote:  

(12-19-2021 04:00 PM)Rodger Rosenbaum Wrote:  << X TRN DUP 1. CON AUGMENT TRN ORTH * Y - >>

I can't find the AUGMENT function in the HP 48G Series AUR Manual.

That's because AUGMENT is part of the HP49g+/HP50g additional functions. :-)

There's an easy way to deal with this. When you type in the X data normally it would be like this:

[ 29945.480 ]
[ 30002.951 ]
[ 30058.926 ]
[ 30114.903 ]
[ 30221.977 ]

But just type in an extra column of 1s like this:

[ 29945.480 1 ]
[ 30002.951 1 ]
[ 30058.926 1 ]
[ 30114.903 1 ]
[ 30221.977 1 ]

and store that in the X variable. Then the OFIT program becomes:

<< X ORTH * Y - >>

Don't add a column of 1s when you're typing the ΣDAT data.