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+--- Thread: Linear Estimation on 41cv ? (/thread-17620.html)
Linear Estimation on 41cv ? - SteveMyers - 10-25-2021 02:44 AM
I am switching from my trusty 11C to a 41CV. (after 30+ years, the 11c is failing)
My 41CV has an Advantage Module, but one fuction I use alot is missing: Linear Estimation.
Today I ordered the complete library of manuals on USB from here thinking the answer will be in there somplace, but I'm hoping someone can help me out and tell me what module I need to find that has linear estimation so I can start the hunt now.
Is it in MATH I, MATH/STAT, STAT 1 or some other custom ROM?
Thanks!
S.M.
RE: Linear Estimation on 41cv ? - Steve Simpkin - 10-25-2021 09:55 AM
Here is a scanned copy of the HP-41C Standard Applications booklet. See the Curve Fitting section starting on page 42. The 155 step program in this section will perform the Linear Regression and Linear Estimation functions (and more) you are looking for.
https://literature.hpcalc.org/community/hp41-standard-en.pdf
RE: Linear Estimation on 41cv ? - Dave Britten - 10-25-2021 12:38 PM
I was always a little perplexed that they didn't include linear regression, but it's pretty easy to add. This program gives you the functionality from the 11C. Note that it expects ΣREG 11. Call XEQ "LR" to calculate the coefficients (this step is required), which will store A, B, and R in registers 17, 18, and 19 respectively. Then you can use XEQ "XHAT" and XEQ "YHAT" to predict x or y values.
Code:
LBL "LR"
MEAN
*
RCL 16
*
CHS
RCL 15
+
RCL 11
X^2
RCL 16
/
CHS
RCL 12
+
/
STO 17
MEAN
RCL 17
*
-
STO 18
MEAN
*
RCL 16
*
CHS
RCL 15
+
RCL 16
1
-
ENTER
ENTER
SDEV
*
*
/
STO 19
RCL 18
RCL 17
RTN
LBL "XHAT"
RCL 18
-
RCL 17
/
RTN
LBL "YHAT"
RCL 17
*
RCL 18
+
ENDRE: Linear Estimation on 41cv ? - rawi - 10-25-2021 01:33 PM
Steve Myers wrote:
Quote:Is it in MATH I, MATH/STAT, STAT 1 or some other custom ROM?
In the Stat Pac you can find (among other programs) programs for linear regression for one to three independent variables as well as curve fitting for a variety of functions (y=a*e^(b*x), y= a + b*ln(x), y = a*c^b). A full description can be found on the website hp41{dot}org under software - hp application pacs - stat pac manual
Best
rawi
RE: Linear Estimation on 41cv ? - Massimo Gnerucci - 10-25-2021 04:21 PM
(10-25-2021 01:33 PM)rawi Wrote: Steve Myers wrote:
Quote:Is it in MATH I, MATH/STAT, STAT 1 or some other custom ROM?
In the Stat Pac you can find (among other programs) programs for linear regression for one to three independent variables as well as curve fitting for a variety of functions (y=a*e^(b*x), y= a + b*ln(x), y = a*c^b). A full description can be found on the website hp41{dot}org under software - hp application pacs - stat pac manual
Best
rawi
Or here.
RE: Linear Estimation on 41cv ? - SteveMyers - 10-26-2021 06:37 PM
Thank you all for the answers!
I'm going to try and find a Stat Module as my day-to-day programs use up most of the storage in my CV.
Thanks again!
RE: Linear Estimation on 41cv ? - SteveMyers - 11-02-2021 12:15 AM
Today I received my USB key with all of the manuals.
It turns out that the HP Advantage Module I already had includes Linear Curve Fitting and works perfectly!
Thanks to all!
S.M.