Standard Pac and Linear regression

11112019, 04:40 PM
(This post was last modified: 11112019 06:39 PM by Trond.)
Post: #1




Standard Pac and Linear regression
Hi everyone!
I am interested in the Standard Pac for HP 41CV, as I understand it includes the linear regression program from the standard applications manual. Is this pac any good otherwise? What else does it contain? (I don't have the standard applications book right now, although may be able to find it in storage somewhere) Does it contain anything not in the Standard Applications book? 

11112019, 05:23 PM
Post: #2




RE: Standard Pac and Linear regression
Standard Pac for which model calculator?
<0ɸ0> Joe 

11112019, 06:38 PM
(This post was last modified: 11112019 06:38 PM by Trond.)
Post: #3




RE: Standard Pac and Linear regression  
11112019, 07:31 PM
Post: #4




RE: Standard Pac and Linear regression
(11112019 04:40 PM)Trond Wrote: Hi everyone! In my opinion, it's pretty useless. The quality of the programs in it is mediocre to poor and there are much much better programs out there for linear regression. For having some coding examples to see and study when you got your 41C for the first time it was barely adequate but otherwise I wouldn't waste a port, RAM, ROM or time to use it. V. All My Articles & other Materials here: Valentin Albillo's HP Collection 

11112019, 08:01 PM
Post: #5




RE: Standard Pac and Linear regression
(11112019 07:31 PM)Valentin Albillo Wrote:(11112019 04:40 PM)Trond Wrote: Hi everyone! Good to know. I'm surprised, because the LR on my HP 34C is pretty good (from about the same time) 

11112019, 11:28 PM
Post: #6




RE: Standard Pac and Linear regression
So...where can I find a good linear regression program for HP 41C?


11122019, 05:53 AM
Post: #7




RE: Standard Pac and Linear regression
(11112019 11:28 PM)Trond Wrote: So...where can I find a good linear regression program for HP 41C? Take a look at the "SM44" entry in here: SandMath "To live or die by your own sword one must first learn to wield it aptly." 

11122019, 06:09 AM
(This post was last modified: 11122019 06:10 AM by Valentin Albillo.)
Post: #8




RE: Standard Pac and Linear regression
(11112019 11:28 PM)Trond Wrote: So...where can I find a good linear regression program for HP 41C? It depends on what kind of "linear regression" are you interested in. For instance:
V. All My Articles & other Materials here: Valentin Albillo's HP Collection 

11122019, 11:59 AM
Post: #9




RE: Standard Pac and Linear regression
Any familiarity with CURVE FITTING FOR PROGRAMMABLE CALCULATORS {ISBN 8943494001} by William M. Kolb?
"PREFACE This book provides all of the essential information needed to fit data to the most common curves. It avoids the usual mathematics and presents instead, straightforward solutions that can be used with most calculators. A basic introduction is included for the novice user of statistical models. The more intrepid explorer may find the sections on derivations, transformations, decomposition and substitution valuable for developing custom curve fitting routines. Users of the HewlettPackard HP41C/V programmable pocket computer can make immediate use of many models presented with the program and bar code included … … 1. REGRESSION One technique used to formulate a statistical relationship among these variables is regression … The most common form of regression is …" 135 pages of documented & illustrated regression analysis & techniques applied to curve fitting on a programmable calculator. BEST! SlideRule 

11122019, 12:27 PM
Post: #10




RE: Standard Pac and Linear regression
(11122019 11:59 AM)SlideRule Wrote: Any familiarity with CURVE FITTING FOR PROGRAMMABLE CALCULATORS {ISBN 8943494001} by William M. Kolb? That would probably be overkill, as it's a MASSIVE program that computes a few dozen fits simultaneously, but it's a fantastic reference if you want to use the formulas therein to implement smaller, more focused programs of your own. 

11122019, 09:12 PM
(This post was last modified: 11122019 09:15 PM by Trond.)
Post: #11




RE: Standard Pac and Linear regression
(11122019 06:09 AM)Valentin Albillo Wrote:(11112019 11:28 PM)Trond Wrote: So...where can I find a good linear regression program for HP 41C? I actually do have it for multiple variables. No, I need a quick number 1 in the list above (straight line, the others usually go by other names). I found the program from the Standard Pac, but then you said it's no good. I can do it on another HP of course (I'm really liking 34c), it's just I think I should have it on the 41CV as well, and this is the calculator I usually take to work. 

11132019, 12:20 PM
Post: #12




RE: Standard Pac and Linear regression
I use this simple program if I need plain old linear regression on my 41:
http://dave.brittens.org/HP41C/LinearRegression.txt I can't remember if I wrote it or found it somewhere else and adapted it slightly. This works off the standard stat registers, so you don't have to use a special program to enter data, and it includes tiny routines for predicting x or y from the value of the other variable. It fits an equation of the form y=mx+b, and also computes correlation. 

11132019, 04:09 PM
Post: #13




RE: Standard Pac and Linear regression
Does it calculate the coefficient of correlation correctly? 8^)
http://www.talkorigins.org/faqs/cdecay.html 

11132019, 09:29 PM
Post: #14




RE: Standard Pac and Linear regression
If your interest extends to the archives, then hp41 howto do simple linear regression? (Posted by David E on 17 Dec 2002) should have modest appeal.
If you use the sigma+ button (top left on the keypad)(after clearing the summation registers using the CLSigma button  shift x<>y key, just below the sigma+ key), you can accumulate the sums of x, x^2, y, y^2, and xy in memory registers 11 through 15 respectively, while register 16 will get the value of n (the number of x,y pairs). To put in your numbers, enter y first, then "ENTER", and then enter your x value  then hit the sigma+ key. After you have entered all you pairs of values, you need to remember (or be told  or, left as an exercise for the student, derive!) the leastsquares fitting expressions for slope, intercept, and correlation coefficient. In case you are rusty: the slope is (n*SUMxy  SUMx*Sumy)/(n*SUMx^2  (Sumx)^2) the intercept has the numerator SUMy*SUMx^2  SUMxy*SUMx (with the same denominator as for the slope) r is (n*SUMXY  SUMx*SUMy) / ( SQRT(n*SUMx^2  (SUMx)^2) * SQRT(n*SUMy^2  (SUMy)^2) ) The above and more awaits your perusal. BEST! SlideRule 

11142019, 12:43 AM
Post: #15




RE: Standard Pac and Linear regression
(11132019 12:20 PM)Dave Britten Wrote: I use this simple program if I need plain old linear regression on my 41: Simple, and it works. Thanks! 

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