Skip to main content
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
Results tagged with
Search options answers only not deleted user 7691

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 …
Yuval Peres's user avatar
  • 14.2k
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 …
Yuval Peres's user avatar
  • 14.2k
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. …
Yuval Peres's user avatar
  • 14.2k
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 …
Yuval Peres's user avatar
  • 14.2k
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 …
Yuval Peres's user avatar
  • 14.2k
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 …
Yuval Peres's user avatar
  • 14.2k
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 …
Yuval Peres's user avatar
  • 14.2k
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 …
Yuval Peres's user avatar
  • 14.2k
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 …
Yuval Peres's user avatar
  • 14.2k
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 …
Yuval Peres's user avatar
  • 14.2k
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 …
Yuval Peres's user avatar
  • 14.2k
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. …
Yuval Peres's user avatar
  • 14.2k
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 …
Yuval Peres's user avatar
  • 14.2k
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 $ …
Yuval Peres's user avatar
  • 14.2k
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? …
Yuval Peres's user avatar
  • 14.2k

15 30 50 per page