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Hi Torsten, I found the problem, I wasn't visualizing the result in a very sensible way. What I thought was mis-fit was simply t...

9448 views

Responded 5 years ago

Hi Steve, thanks for the advice. NULL does work very well in the case of zero noise, but as soon as I add some noise to the data...

Hi Torsten Your right, (A,B,C,D) = (0,0,0,0) isn't what I want. I tried the method you suggested and it works really nicely. One...

Hi all, I’m working with experimental data which is represented as a series of x and y values (both x and y are non-negati...

Posted 5 years ago

The question of how far I need to go into the tails is a bit of an open one. I'm using this approach in an attempt to identify a...

5988 views

Responded 6 years ago

Thanks John, that is an extremely demonstrative piece of code, Dave

Dear All, It is an interesting point that the replacement will have little effect given a large enough value of N. As Tristram m...

Hi Bruno, sorry if this led to confusion, I hoped that I had made this aspect explicit in the original problem when stating that...

Thanks for your input, the sampling it assumed to be without replacement. The problem derives from attempting to form significan...

Can anybody suggest an efficient method to approach this problem? Choose W unique random integers drawn from 1 to N, what is th...

Posted 6 years ago

Thank you Roger for your advice, unfortunately, I cannot assume that the principle axes are aligned with the coordinate axes. Ho...

5523 views

Dear All, I have a (hopefully noise free) collection of points which should all lie on the surface of an ellipse / ellipsoid / h...

Hi Peter, thanks for your detailed reply. I was using an old version of normfit, I've now updated and things are much clearer wi...

3291 views

Responded 7 years ago

Hi All, I’m trying to use "normfit" to estimate the 95% confidence limit for the mean of a series of normally distributed ...

Posted 7 years ago

Hi Bruno, thanks for the suggestion and the code. For a collection of test data the separable least-squares approach certainly s...

2543 views

Responded 4 years ago

Hi All, I've got some experimental data (x,y) which from theory I know I should be able to fit using the equation y=a+b.*x+c.*x....

Posted 4 years ago

Thanks, that's just what I needed, Dave

1992 views

Hi, can anyone offer advice on how to adjust the positions of axes in matlab plots. By default the x and y axes always cross at ...

834 views