how to plot probability density of a given data

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sbei arafet 2016-4-23

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编辑： sbei arafet 2016-4-24

Hi,

I tried to get something like this

i want to know if ksdensity is the best solution

Thanks in advance

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the cyclist 2016-4-23

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I would say that there is a very good chance that ksdensity is the function you want to use. If you want a smooth curve that estimates the probability density function of your data, then it's a good choice.

The main question, which you do not provide any information about, is "What is your input data?" Do you have a sample of actual data that you want the density of? That's what you'll need to use ksdensity.

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Image Analyst 2016-4-23

fitdist() can take as an input quite a number of distributions to fit your data to, not only Normal. If you believe you have one on its list, then put that in.

Do you have any theory as to what your distribution might be? Otherwise, can you show us a screenshot of the histogram of your actual data - the actual observations instead of the smooth theoretical curve you showed so far?

sbei arafet 2016-4-23

编辑：sbei arafet 2016-4-24

Hi,

According to fuzzy connectedness theory the affinity function takes a normal distibution the general form is

so i thought to plot my data with normal distribution wich are as the cyclist said not normal and i can't design a function from a plot using ksdensity, that's why i assumed that this distribution is normal,

here is a screenshot of the histogram: