the magnitude of y-axis in a ksdensity plot
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Dear all,
Can you explain the meaning of magnitude of y-axis in a plot using ksdensity function?
Thank you very much.
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Accepted Answer
the cyclist
on 5 Oct 2014
Edited: the cyclist
on 5 Oct 2014
It's the function f(x) such that
f(x) * dx
is the probability of a randomly selected value from the distribution being in that particular interval of x.
People are sometimes confused by the fact that the output of ksdensity doesn't sum to 1. You have to remember to multiply by the interval width. Then it will.
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the cyclist
on 6 Oct 2014
MATLAB doesn't know that negative values of x don't make physical sense.
But you can tell the function not to allow negative values by using additional arguments:
[f xi] = ksdensity(...,'support','positive')
See the documentation for details.
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