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I found an old HP11 (still in working condition), but I forgot how to run the linear regression program on it. Can somebody jog my memory?
Dave

First make sure the stat sum registers are clear by pressing the [f][GSB] keys.

To enter data:

1) Type the value for y
2) Press [Enter]
3) Type value for x
4) Press the [sigma plus] key

To get the linear regression coefficients press [f][sigma +] keys.

To remove data:

1) Type the value for y
2) Press [Enter]
3) Type value for x
4) Press the [g][sigma plus] keys

Thank you for your help: those steps got my Y intercept point; does this have the capability to calculate the slope also? (using Y=ax+b formula)?

To see the slope, click the [x<>y] button after you click the [f][sigma +] keys.

I suggest you either buy a copy of the HP-11C user's manual from eBay or get the museum CDs/DVD that contains the two manuals (user's manual and applications manual) for the HP-11C.

You can probably download the Hp12c manual in PDF format from Hp. The Stats and linear regression are either the same or very close in operations. If you can just select chapters, you can be selective.

The HP-12C has linear regression commands that are quite different from the HP-11C. For one, the 12C does not have keys to calculate the slope & intercept and push them into the stack like the 11C does.

Dave posted,

Quote:
does this have the capability to calculate the slope also? (using Y=ax+b formula)?

Crikey! Didja take a look at the back plate of the HP-11C (assuming it is still there, and readable)? It's got a diagram 'n' everything for the "L.R." linear regression function.

Namir posted,

Quote:
To see the slope, click the [x<>y] button after you click the [f][sigma +] keys.

I suggest you either buy a copy of the HP-11C user's manual from eBay or get the museum CDs/DVD that contains the two manuals (user's manual and applications manual) for the HP-11C.

Amen to that...

-- KS

The back plate is there:
http://www.hpmuseum.org/11cbk.jpg

Arnaud

Mine still has a pretty intact back plate; its got some good info. I still like the idea of buying the manual. The backplate doesnt give me enough information to run the LR program. Namir's instructions were right on the money. Incidently, I'm 53; the oldest guy in my Physics class. The calculator is older than some of the students; next week I'll bring in my slide rule.