Search found 1681 matches

by Walter
Mon Sep 27, 2021 10:19 pm
Forum: Discuss!
Topic: 43S News
Replies: 1274
Views: 357153

Re: 43S News

PierreMengisen wrote:
Mon Sep 27, 2021 9:38 pm
LocR seems to be activated but causes a crash.
LocR makes sense in programs only. Programming is not functional yet. Please don't use LocR.

Nevertheless: merci and 22 more points for you! 8-)
by Walter
Mon Sep 27, 2021 6:37 pm
Forum: Discuss!
Topic: 43S News
Replies: 1274
Views: 357153

Re: 43S News

Merci! Just a question: why use small caps on p 157 of RefMan for ADM, ... ..., #DEC ? All predefined variables and system flags are printed this way in the manuals (cf. p. 9). other remark : I think you should indicate how to delete HIDE nn by ordering HIDE 00 Merci. Done. and other typo problem : ...
by Walter
Mon Sep 27, 2021 1:12 pm
Forum: Discuss!
Topic: 43S News
Replies: 1274
Views: 357153

Re: 43S News

Looks like the matrix division problem Pierre found is solved with 0.20.9. :D
by Walter
Sun Sep 26, 2021 9:37 pm
Forum: Discuss!
Topic: Standard error of forecast
Replies: 10
Views: 742

Re: Standard error of forecast

FYI, you find the properly formatted result for the standard error on p. 229 of the WP 43S Reference Manual now. And this manual is provided at https://gitlab.com/Over_score/wp43s/-/releases.
by Walter
Sat Sep 25, 2021 10:54 pm
Forum: Discuss!
Topic: 43S News
Replies: 1274
Views: 357153

Re: 43S News

Release 0.20.9 is here https://gitlab.com/Over_score/wp43s/-/releases. We added new commands: HIDE and HIDE?. We refined dealing with matrices (which is work in progress still). And the manuals were refined, of course (changed passages are marked in red there). Included in the release package is ev...
by Walter
Wed Sep 22, 2021 9:36 pm
Forum: Bug reports
Topic: [DM15L] trig functions
Replies: 4
Views: 224

Re: [DM15L] trig functions

When I type 2>pi>×>SIN using the Radian angular display the result is not 0 (zero). Instead, its 8.2E-10. That's because you don't get exactly 2\(\pi\) when you type [2] [PI] [x]. What you get is a number that's correct to 10 decimal places, so close to 2\(\pi\) but not equal to 2\(\pi\). You're th...
by Walter
Tue Sep 14, 2021 2:23 pm
Forum: Discuss!
Topic: Standard error of forecast
Replies: 10
Views: 742

Re: Standard error of forecast

Found the errors I made: For calculating t^(-1) for the standard error of a forecast f on the regression line, the probability must be set to one minus half the error probability, i.e. 1 - (1 - 0.683)/2 = 0.8415. Then t^(-1) approx. equals 1, so ditching this factor in the formula S(f) = t^(-1)(n-2,...
by Walter
Fri Sep 10, 2021 7:43 pm
Forum: Discuss!
Topic: Standard error of forecast
Replies: 10
Views: 742

Re: Standard error of forecast (error propagation in fitting?)

This t^(-1) is the inverse of the t distribution for n-2 degrees of freedom and a probability of 0.683 (it returns some 0.5 ± 5%). I found this looking at some old books and papers explaining confidence limits for the estimated forecast (Schätzwert). The probability 0.683 corresponds to the standard...
by Walter
Wed Sep 08, 2021 10:18 pm
Forum: Discuss!
Topic: Standard error of forecast
Replies: 10
Views: 742

Re: Standard error of forecast (error propagation in fitting?)

the formula for the variance of a forecasting value f is: S(f)^2 = S(e)^2 * (1+(1/N) + (x0-mean(x))^2/sum(xi-mean(x))^2) Whereas: N = number of observations mean(x) = arithmetic mean of x x0 = value of x for which you want a forecast Se^2 = sum(yi-(a+b*xi))^2/(N-2) a is the constant, b the slope of...
by Walter
Sat Sep 04, 2021 9:38 pm
Forum: Discuss!
Topic: WP 43S Pilot Run (Poll!)
Replies: 338
Views: 87842

Re: WP 43S Pilot Run (Poll!)

Yes, in principle. We are pretty sure that's it for the primary labels now. Though nothing's really carved in stone as long as no production tools are made (and a change of shifted labels only won't be a show-stopper even after the pilot batch since you could cope with it using an appropriate overla...