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Mathematica

Error with KolmogorovSmirnovTest (and DistributionFitTest)

Michael E
Posted 10 years ago
POSTED BY: Michael E
5 Replies
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Michael E
Michael E
Posted 10 years ago

Thank you for your reply!

Now I understand...

Referring to https://reference.wolfram.com/language/ref/KolmogorovSmirnovTest.html, I thought the input syntax for multivariate data "{{x1,y1,...},{x2,y2,...},...}" was limited to 2D data, with next to each "x", its different corresponding values in the second (same) dimension.

Thank you again
POSTED BY: Michael E 
In[18]:= data = {{{2, 4, 3}, {3, 9, 4}}, {{2, 4, 3}, {3, 9, 4}}};

In[19]:= KolmogorovSmirnovTest[data]

Out[19]= KolmogorovSmirnovTest[{{{2, 4, 3}, {3, 9, 4}}, {{2, 4, 
    3}, {3, 9, 4}}}]

In[20]:= Show[SmoothHistogram[data, PlotStyle -> Orange], 
 Plot[PDF[NormalDistribution[], x], {x, -4, 4}]]

enter image description here
POSTED BY: Simon Cadrin

If I understand you correctly, you are giving a list of values like:

{{x,y1,y2, y3...}, ....}

That is not the form of input that the function accepts.

The input to the function should instead look like: 

{{x,y1}, {x,y2}, {x,y3}}, ....}

In a previous post on the form, you asked how to convert from this format into the incorrect format you are using above.
POSTED BY: Sean Clarke
Michael E
Michael E
Posted 10 years ago
POSTED BY: Michael E

You cannot use a non-rectangular array. It doesn't make sense. What kind of distribution gives out vectors of different lengths?

Can you define what it means to do a goodness of fit test against a set of vectors of different lenghts?
POSTED BY: Sean Clarke
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