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 ▼ Dave Bleam Junior Member Posts: 3 Threads: 1 Joined: Jan 1970 10-17-2005, 08:34 PM 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 ▼ Namir Posting Freak Posts: 2,247 Threads: 200 Joined: Jun 2005 10-17-2005, 11:27 PM 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 ▼ Dave Bleam Junior Member Posts: 3 Threads: 1 Joined: Jan 1970 10-18-2005, 11:07 PM 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)? ▼ Namir Posting Freak Posts: 2,247 Threads: 200 Joined: Jun 2005 10-19-2005, 09:19 AM 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. Karl Schneider Posting Freak Posts: 1,792 Threads: 62 Joined: Jan 2005 10-19-2005, 09:54 PM 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 ▼ Arnaud Amiel Senior Member Posts: 362 Threads: 30 Joined: Jul 2005 10-20-2005, 08:17 AM The back plate is there: http://www.hpmuseum.org/11cbk.jpg Arnaud Ron Ross Senior Member Posts: 673 Threads: 20 Joined: Oct 2008 10-19-2005, 10:52 AM 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. ▼ Namir Posting Freak Posts: 2,247 Threads: 200 Joined: Jun 2005 10-19-2005, 11:45 AM 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 Bleam Junior Member Posts: 3 Threads: 1 Joined: Jan 1970 10-20-2005, 09:36 PM 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.

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