The Museum of HP Calculators

HP Forum Archive 15

 HP11Message #1 Posted by Dave Bleam on 17 Oct 2005, 8:34 p.m. 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

 Re: HP11Message #2 Posted by Namir on 17 Oct 2005, 11:27 p.m.,in response to message #1 by Dave Bleam 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

 Re: HP11Message #3 Posted by Dave Bleam on 18 Oct 2005, 11:07 p.m.,in response to message #2 by Namir 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)?

 Re: HP11Message #4 Posted by Namir on 19 Oct 2005, 9:19 a.m.,in response to message #3 by Dave Bleam 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.

 HP-11C *back plate*Message #5 Posted by Karl Schneider on 19 Oct 2005, 9:54 p.m.,in response to message #3 by Dave Bleam 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

 Re: HP-11C *back plate*Message #6 Posted by Arnaud Amiel on 20 Oct 2005, 8:17 a.m.,in response to message #5 by Karl Schneider The back plate is there: http://www.hpmuseum.org/11cbk.jpg Arnaud

 Re: HP11Message #7 Posted by Ron Ross on 19 Oct 2005, 10:52 a.m.,in response to message #1 by Dave Bleam 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.

 Re: HP11Message #8 Posted by Namir on 19 Oct 2005, 11:45 a.m.,in response to message #7 by Ron Ross 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.

 Re: HP11Message #9 Posted by Dave Bleam on 20 Oct 2005, 9:36 p.m.,in response to message #8 by Namir 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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