How to fit a log-normal dist. to data in x-data and y-data format using 'lognfit'?

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Mohammad Monfared 2015-6-22

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https://ww2.mathworks.cn/matlabcentral/answers/224859-how-to-fit-a-log-normal-dist-to-data-in-x-data-and-y-data-format-using-lognfit

评论： Torsten 2015-6-25

Hi,

This is the problem: I have a set of points to which I'd like to fit the log-normal distribution. I have two vectors for their X and Y values. I ran into 'lognfit' function which just accept a single vector as its input. I know this can be performed by something like 'lsqcurvefit', but I need to get the confidence intervals for the mu and sigma which 'lognfit' function returns easily as its output. Could anyone help please?

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Answer 1

Torsten 2015-6-23

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http://de.mathworks.com/help/stats/nlparci.html

Best wishes

Torsten.

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Mohammad Monfared 2015-6-24

Thanks a lot!

Torsten 2015-6-25

If you have the original data from which the (X,Y) vectors have been derived, you should work with them and use "lognfit" to get mu and sigma. I guess the confidence intervals for the parameters will be different if you explicitly know the underlying distribution.

Best wishes

Torsten.

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How to fit a log-normal dist. to data in x-data and y-data format using 'lognfit'?

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