Getting parameters of statistic using probplot()

Hi all, I kindly ask you a couple of suggestion. I'm using probplot() with my sets of data, in order to understand if they come from certain distribution; the results are good and the data fit, in particular they come from Rayleigh (it is clear looking at the picture: most of my points overlap the dashed line) but I need to know also with which parameter I can say it, mathematically. Another good information would be the error, so the distance between the dashed line and my points. Thanks in advance to who will help me.

Answer 1

[dpb]

probplot only does the visualization; for some reason TMW didn't deign to return the parameters for the data fit--seems like a reasonable expectation of the user, though, agreed.

You'll have to use fitdist or the tool to estimate the parameters and then use those to evaluate the expected values from the functional form.

Answer 2

[Fran]

Hi dbp,

thanks for your hint, may I ask you to be a bit more detailed? I took a look on how to use fitdist, but once I create a probability distribution object fitting the chosen distribution with my data, I don't know how to calculate the error. I found too many information in the forum and probably I'm getting confused.

Thanks in advance! I really appreciate it.