# Recent content by Koen Van de moortel

1. ### Is there a good tool for finding the best curve to fit my data?

I don't know all the inventions of the number crunchers who are - in my modest opinion - making things often way too complicated, but I did get the courses we needed in physics, about probability, distributions, error propagation, least squares regression, numerical analysis, etc. And I do have...
2. ### Is there a good tool for finding the best curve to fit my data?

You said "THE" empirical distribution. I can only imagine AN empirical distribution. And that doesn't explain anything about the underlying mechanism, just fitting a polynome doesn't explain anything. Seriously. And my graphs in #42 are just normal OLS fittings of the given data with the...
3. ### Is there a good tool for finding the best curve to fit my data?

All I can say is that it fits a lot obviously better than the author's graph. I just wondered how that could be so strange, so I tried it myself. I'm not claiming to know if this has to be a normal distribution; that will not be an easy thing to calculate I guess, and as above mentioned, it...
4. ### Is there a good tool for finding the best curve to fit my data?

I know all this. It's not the same as my MDLS method. What 's wrong with the Deming method is that it treats x and y as if they have the same dimension and units. But how can you define an orthogonal distance if e.g. x=current and y=voltage?

see above
6. ### Is there a good tool for finding the best curve to fit my data?

This is what I get, 1) including the zeroes (for which I had to give an error of 1), 2) without the zeroes, and in each case with fixed parameter N (should be the total of wins = 464) and with free N. BTW, this is ordinary least squares regression with iteration.
7. ### Is there a good tool for finding the best curve to fit my data?

@GretaGarbo What do you mean? "The distribution for the data"? This is an example of a fitted Gauss distribution, included with the program.
8. ### Is there a good tool for finding the best curve to fit my data?

It's published in the above mentioned journal, and I can assure you that I have done extensive research to test it. See: https://www.researchgate.net/profile/Koen-Van-De-Moortel/research And, you can test the software 25 days for free, with your own data. I'm curious to see your findings!
9. ### Comparing two means derived from the same sample

BTW, Corpulence index (m/h³) is a better variable than BMI (m/h²); see: https://www.researchgate.net/publication/358736303_The_Body_Mass_Index_recalculated
10. ### Is there a good tool for finding the best curve to fit my data?

@GretaGarbo Yes, the software is meant to find the best fitting parameters for a number of models, by iteration and taking measurement imprecisions into account (most of the others just neglect that). In the current version, you can also find the best fitting Gauss distribution or a mix of two...
11. ### Regression Checklist

The most important is that you have an idea what kind of function describes the relationship between your data! Otherwise you are just guessing around.
12. ### Help! What analysis should be performed on a dataset like this?

Maybe it's too late, but this is what I would do: a linear fit of heat output vs work level/mass. What do think? Does it make sense?
13. ### Help! What analysis should be performed on a dataset like this?

I would add to this: you can't nor shouldn't force the residuals to be normally distributed. If they are not normally distributed, it's just an indication that another variable is influencing your dependent variable.
14. ### How to find the best regression model

The only good model is one that is supported by a physical theory! All the others are just guessing work.
15. ### Plotting Error Bars

This is automatically done in this software: www.lerenisplezant.be/fitting.htm