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Jul
5
answered How I can count multiplications in an experssion?
Jul
1
comment How to create a thick spiral then extract the coordinates from the image?
This caused me to experiment with drawing random spiral galaxies. Thanks for the diversion!
Jun
21
revised Efficient Sampling of A (Countable) Discrete Distribution
added 68 characters in body
Jun
21
revised Efficient Sampling of A (Countable) Discrete Distribution
added 8 characters in body
Jun
21
answered Efficient Sampling of A (Countable) Discrete Distribution
Jun
21
comment Efficient Sampling of A (Countable) Discrete Distribution
Unfortunately 100k terms doesn't even reach the 99th percentile which is where things really slow down. Heavy tails are a pain.
Jun
21
comment Efficient Sampling of A (Countable) Discrete Distribution
You can get a small speed up by premultiplying by A and removing that from the test in the loop. A significant speed up can be gained by compilation. However, the given distribution has a very heavy tail and so it is tricky to be fast for large quantiles without some adaptive sampling which is also tricky since the distribution involves Zeta functions that can't be compiled.
Jun
19
revised P-Values are inconsistent when using DistributionFitTest repeatedly
added 43 characters in body
Jun
18
answered P-Values are inconsistent when using DistributionFitTest repeatedly
Jun
18
comment P-Values are inconsistent when using DistributionFitTest repeatedly
Under the null hypothesis the p-value has a uniform distribution on (0,1). So, you would expect 5% of the values to fall at or below 0.05 for example.
Jun
16
answered Is DistributionFitTest broken for some cases of TransformedDistribution targets?
Jun
16
comment Is DistributionFitTest broken for some cases of TransformedDistribution targets?
The CDF is required for the chi square test in order to build bins. If CDF doesn't compute DFT will fail. As for why the CDF fails I'm not sure.
May
2
comment Second derivative of SmoothKernelDistribution PDF?
You might try KernelMixtureDistribution to avoid the piecewise linear limitation
Apr
20
answered Is this behavior of DistributionFitTest together with StableDistribution a bug?
Apr
19
comment Why do EstimatedDistribution and DistributionFitTest work this way
I recommend reading the following en.m.wikipedia.org/wiki/Lilliefors_test
Apr
19
comment Why do EstimatedDistribution and DistributionFitTest work this way
In one case the parameters are estimated internally. The null distribution for the tests assume the parameters are known apriori and so a correction to the p-value must be applied to account for the estimation. If you provide a fitted distribution the test assumes known parameters and makes no correction.
Mar
16
comment Generate a sample from a multivariate Cauchy distribution
Why not use MultivariateTDistribution with v = 1?
Feb
26
awarded  Notable Question
Feb
24
comment Creating Identification/Classification trees
mathematica.stackexchange.com/questions/19285/… may help
Feb
5
comment Is there a convenient way to sum TimeSeries objects in Mathematica?
You can also set the missing data method on the TimeSeries objects to None. Not sure if that will work, I don't have M in front of me to try it.