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HP 48G Linear Regression Best Fit Line
12-21-2021, 08:42 AM (This post was last modified: 12-21-2021 11:11 PM by Rodger Rosenbaum.)
Post: #41
RE: HP 48G Linear Regression Best Fit Line
Troubleshooting:

Edit: When I ask you what you see, if the X or Y data matrix is on the stack don't bother typing out the whole thing as what you see, just type "X matrix", or "Y matrix". You will be able to tell if it's ok. But for things like the result from executing ORTHO the result should be small enough to type out the whole thing.

After you do the "Fit data" in the statistics menu, there are 3 items on the stack--just drop them.

Execute LR; what do you see on the stack? It should be error free--drop anything on the stack.

Execute ORTH (press the softkey for ORTH); what do you see on the stack? it should be error free--clear the stack.

You can run OFIT manually a step at a time. Recall X to the stack by pressing the softkey for the X variable; what do you see?

Press the softkey for ORTH; what do you see?

Type "DUP" and press enter; what do you see?

Type "1." and press enter; what do you see?

Type "GET" and press enter; what do you see?

Apparently the error will occur when we try to execute "GET", so the contents of the stack here, and just before the "GET", should tell us what the problem is.
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RE: HP 48G Linear Regression Best Fit Line - Rodger Rosenbaum - 12-21-2021 08:42 AM



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