Questions tagged [sample-statistics]
For questions directly related to various sample statistics: mean, median, variance, various quantiles, test and order statistics, sample moments, Dice coefficient, Jaccard index, etc.
7 questions
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Efficient sum of distributions (mixture distribution) and sampling
I manage to implement adaptive sampling by drawing samples iteratively from an update distribution which is represented by a mixture of two distributions, such that
$$ρ_{new} = a * ρ_{old} + (1 - a) * ...
- 65
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Parameter estimation simple theory question related to scipy.optimize.curve_fit
It has been a while since I have done some stats, and I have tried to fit a curve using optimize.curve_fit of parameter estimation. I am also interested in the standard deviation of the fitted ...
- 109
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3
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Optimization on MCMC codes
I am looking for MCMC codes with a GPU suport (like NVIDIA or OpenCL libraries) to make faster run chains.
If someone could have a state of the art ...
user14831
2
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2
answers
499
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Generating particles from a distribution function using Monte Carlo
I have been given a 4D ($x, y, v_x, v_y$) distribution function, $f(x,y,v_x, v_y)$, generated by an external code. I want to generate a set of particles from this distribution function, say 10k ...
user38535
4
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1
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Understand the need for Welford's online algorithm
I am puzzled by the Wikipedia entry discussing many online algorithms for computing the sample variance, including the Welford's online algorithm.
In particular, the sample variance $s_n^2$ can be ...
- 141
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2
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251
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Different questions about "Inverse Physics problems"
I am in a context of forecasts in astrophysics. Don't be too rude if questions seem to you stupid or naive but rather indulgent, I am just looking for better undertsand all these numerical methods of ...
user14831
2
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1
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56
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Correct relative error for Comparison of levelsets outside a constrained region
I am working on the estimation of tumor extent outside of the region which is visible in MRT/CT/DTI images. I want to compare two methods, which approximate the tumor density profile.
Lets say the ...
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