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Applied and theoretical statistics: e.g. statistical inference, regression, time series, multivariate analysis, data analysis, Markov chain Monte Carlo, design of experiments.

3 votes

Projections in infinite dimensional statistical manifolds

Are you trying to construct an infinite-dimensional (Hilbert) manifold of probability measures on a fixed measurable space? Or you simply want to find a Bergman divergence analog in order to generaliz …
Henry.L's user avatar
  • 8,071
0 votes

Spectra of spatial and temporal covariance matrices

@Carlo's answer is very insightful from a physics perspective, thanks a lot for the teaching and learning here. My answer is from a more ML and statistic perspective as @Ed Smith asked. But in the OP, …
Henry.L's user avatar
  • 8,071
1 vote

Non-parametric regression and curvature

I may start answering by pointing out that the term "nonparametrics statistics" is essentially "parametric". The existing methods (e.g. Smoothing splines) in nonparametrics, are somehow all parametriz …
Henry.L's user avatar
  • 8,071
1 vote
Accepted

A metric stronger than total variation

I think it is just called (scaled) supremum $L_1$ norm and it is mostly studied in Bayesian nonparametric estimation literature, especially posterior consistency. The following paper investigate condi …
Henry.L's user avatar
  • 8,071
32 votes
3 answers
12k views

What is the Katz-Sarnak philosophy?

It has been recently mentioned by a speaker (his talk is completely not relevant to random matrix theory/RMT though) that modern statistics, especially random matrices theory, will help solving some n …
Henry.L's user avatar
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1 vote

Largest deviations for uniform order statistics

Iosif Pinelis provided a very nice answer, however, I would like to provide a more comprehensive answer to this question. I think the title is a bit misleading because we do not actually need the orde …
Henry.L's user avatar
  • 8,071
1 vote

Bounding the "spikiness" of a probability distribution

Non-Gaussianness is an ambiguous concept. In the continuum of probability distributions such as the uniform, where all events are clustered into a given range and equally likely. On the other s …
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  • 8,071
2 votes
Accepted

Expand the pdf of Wishart distribution into power series via orthogonal polynomials

Note that the Laguerre orthogonal polynomials are in form of [1](bearing combinatoric interpretation) and [3] \begin{align} & L_n^\nu(x)=(-1)^n\sum_{m=0}^n \binom n m \prod_{i=1}^m (\nu+2(n-i))(-x)^{ …
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  • 8,071
4 votes
Accepted

Square integrable conditional expectations as projections

No. Vector space structure is not enough, we actually need a compatible lattice structure to make things work. To apply the conditional expectation operator $E(\bullet\mid Y)$ onto the Hilbert space c …
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  • 8,071
3 votes

Looking for a certain kind of a distribution

(1) supported on half planes of $\mathbb{R}^n$, you may want to look at folded Gaussian distributions. (2) supported on a compact surface like $\mathbb{S}^n$, you may want to look at projected Gaussi …
Henry.L's user avatar
  • 8,071
2 votes

Weak convergence for discrete-time processes using characteristic functions

If the process you concern is a harmonizable process then Bochner Theorem can be easily generalized into discrete time case by regarding it as Fourier representation. And in some more specific cases D …
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  • 8,071
18 votes

Manifold of probability measures: connections between two types of metrics

In response to the critical comments below I revised my answer. Hope this is more helpful! (1) Two kinds of metrics are defined on generally different spaces. It is not fair to compare these two met …
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5 votes
Accepted

Does MCMC overcome the curse of dimensionality?

You need a global convexity to enjoy the optimal convergence rate, otherwise even local convexity will almost surely(not in probabilistic sense) lead to the worst rate you pointed out. MCMC(Markov Ch …
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1 vote

Can we find an Stein operator characterizing a distribution without density function?

The answer is yes. Stein operator is essentially no more than a differential equation $E$(written as an operator notation) which characterized a distribution $f$ as its unique solution. That is the re …
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  • 8,071
0 votes

Determinant of correlation matrix of autoregressive model

A thorough discussion is contained in Finch, P. D. "On the covariance determinants of moving-average and autoregressive models." Biometrika 47.1/2 (1960): 194-196. JSTOR But it is more common …
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