Search Results
Search type | Search syntax |
---|---|
Tags | [tag] |
Exact | "words here" |
Author |
user:1234 user:me (yours) |
Score |
score:3 (3+) score:0 (none) |
Answers |
answers:3 (3+) answers:0 (none) isaccepted:yes hasaccepted:no inquestion:1234 |
Views | views:250 |
Code | code:"if (foo != bar)" |
Sections |
title:apples body:"apples oranges" |
URL | url:"*.example.com" |
Saves | in:saves |
Status |
closed:yes duplicate:no migrated:no wiki:no |
Types |
is:question is:answer |
Exclude |
-[tag] -apples |
For more details on advanced search visit our help page |
In probability and statistics, a probability distribution assigns a probability to each measurable subset of the possible outcomes of a random experiment, survey, or procedure of statistical inference.
3
votes
Accepted
How to derive this change of measure identity in multi-armed bandits?
Shishir, this is quite elementary: write the probability $P_2(\omega)$ of any individual bit sequence $\omega$ as $P_1(\omega) f(\omega)$ where by definition, $f(\omega)=\exp(-\hat{kl}_n)$. Finally, s …
3
votes
Samples from a modified Bernoulli
Perhaps most relevant is [1] which discusses this construction and reduces the general case to $c=2$. See Theorem 1 and proposition 15 there. Note that $cp \le 1$ is not a sufficient condition; an in …
0
votes
Greater contribution in a sum of independent random variables
The paper by Heyde discussed in Iosif Pinelis' excellent answer concerns a more general situation where the summands are not stable but rather there is convergence to a stable law after normalization. …
1
vote
$k^{\text{th}}$ maxima of $n$ i.i.d chi-square random variables
The behavior of the order statistics is different than you predicted: Suppose that $k=n-\ell$, where $\ell=\ell(n)$ satisfies $\ell/n \to 0$. Denote by $Z$ a standard normal variable.
Then for $b \in …
1
vote
General definition for $k$-dependence of a family of sub-$\sigma$-algebra
One possible definition is to assume a graph structure on the index set, where the maximal degree is $k$. Then you assume that every algebra $\mathcal{F}_i$ is independent of the join of the algebras …
2
votes
Accepted
On the speed of divergence of the converse of the Strong law of large numbers
Such a sequence $a_n$ does not exist even for a well studied example like returns to the origin of simple random walk in one dimension. If $X_i$ denotes the number of steps from the $i-1$ time the wal …
2
votes
Bounded difference functions and sub-Gaussian random variables
The implication goes the other way.
The "standard" inequality you quote, usually called McDiarmid's inequality
is derived from the second inequality that you ask about. See e.g. http://empslocal.ex.a …
6
votes
Accepted
Is there a 1/poly(n) or 1/polylogn upper-bound for this tail bound?
Let $A:=\Bigg\{\bigg\vert\dfrac{\sum_{j=1}^n(\sum_{i=1}^n a_{ij})^2}{n^2} -1\bigg\vert > \epsilon\Bigg\}\,$ denote the event in question. We will show that
$\operatorname{P}(A)\le C_{\epsilon}/n$
f …
6
votes
Accepted
Sum of random variables are equal in distribution
There is$^*$ a counterexample in the atomic case, see below, so we will assume that $(\Omega, \mathrm{P})$ is a non-atomic standard Lebesgue probability space (so it is Isomorphic to the unit interval …
1
vote
Is there some similar spine decomposition for Galton-Watson tree in supercritical case whose...
Lyons, Russell, Robin Pemantle, and Yuval Peres. "Conceptual proofs of L log L criteria for mean behavior of branching processes." The Annals of Probability (1995): 1125-1138. https://www.jstor.org/s …
26
votes
Accepted
A variation of the law of large numbers for random points in a square
Given $n^2$ i.i.d. uniform points in $[0,1]^2$, the goal is to draw a configuration of $cn$ vertical lines and $cn$ horizontal lines such that in each small rectangle there is at most one marked point …
3
votes
Accepted
Distribution of a stopped random sum, with subexponential stopping time
The hypothesis implies that $M_k=[e^{\sum_{n=1}^k X_n}]$ is a supermartingale, with $M_0=1$. Then the optional stopping theorem for positive supermartingales implies the requested inequality. (see e. …
1
vote
Find $\inf_{P_{X_1,X_2}}P_{X_1,X_2}(\|X_1-X_2\| > 2\alpha)$ , where $\alpha > 0$ and inf is ...
As Iosif wrote, the conjecture does not hold. Suppose $\alpha=1$ and $X_1$ takes the values 0,1,2 with equal probability and $X_2$ takes the values 0,2 with equal probability. Then $h(1)=0$ but transl …
1
vote
Accepted
Exponential upper bounds for sums of martingale differences
Let $J$ take the value $M$ with probability $1/M^2$ and the value 1 with probability $1-1/M^2$. Let $R_i$ be i.i.d. $\pm 1$ valued random variables of of mean zero, and define $X_i:=JR_i$. Then for $ …
2
votes
Accepted
Stationary and limiting distributions
For Markov chains, a very useful condition is Harris recurrence,
see https://en.wikipedia.org/wiki/Harris_chain.
This has been generalized to continuous time, see
https://www.jstor.org/stable/3690386? …