HP 48G Linear Regression Best Fit Line

[Rodger Rosenbaum]

(12-25-2021 02:26 AM)MNH Wrote:  

(12-19-2021 01:08 AM)Rodger Rosenbaum Wrote:  After you enter the data into ΣDAT you need to get into the statistics menu and execute the "Fit data" function (it's the 3rd function in the list). Doing this will fill in all the summary statistics such as ΣX, ΣY, ΣXY, etc. Without doing this the LR function, and the ORTH program won't work.

How can I store my own data into the summary statistics variables?

As I mentioned earlier, executing LR does the job. Why would you want to do it yourself?

There is a substantial advantage to letting the HP48 do it. When the HP48 does it, the calculations are done using the internal 15 digit arithmetic. If you do it yourself, you will be doing it with 12 digit arithmetic (if you do the calculations on the HP48) and lose substantial accuracy.