Questions tagged [cumulants]
The cumulants tag has no usage guidance.
20
questions
10
votes
3
answers
933
views
What did Rota mean by "one can define cumulants relative to any sequence of binomial type"?
This question is cross-posted from MSE.$\newcommand{\E}{\mathbb{E}}$
Near the end of "Finite Operator Calculus" (1976), G.C. Rota writes:
Note that one can define cumulants relative to any ...
9
votes
2
answers
437
views
Is there a determinantal point process proof of the Keating-Snaith formula for the cumulants of the log characteristic polynomial of a random matrix?
For $U$ a unitary $N \times N$ matrix, randomly distributed according to Haar measure, we have the complex-valued random variable $\log (\det (1-U))$. The real part and imaginary parts of $\log (\det (...
0
votes
1
answer
506
views
Was this proposition on cumulants of compound Poisson distributions known before I put it into a Wikipedia article?
The $n$th cumulant $\kappa_n$ of a probability distribution for $n\ge2$ is functional that is a polynomial in the first $n$ moments of the distribution, that has the properties of $(1)$ homogeneity, $(...
3
votes
0
answers
106
views
Cumulants as coefficients of degree-n polynomial and conditions for real roots
In a $(n-1)$-degree polynomial, $P_{n-1}(z) = c_{n-1} z^{n-1} + c_{n-2} z^{n-2} + \ldots + c_0$, defined by,
\begin{equation}
P_{n-1}(z) = \sum\limits_{i=1}^n \, \prod\limits_{j=1,j\neq i}^n (z-x_j)
\...
1
vote
1
answer
338
views
How is 4th order cumulant of a complex random vector defined?
Suppose that ${\bf x} \in\mathbb C^n$ is a complex random vector, we know the mean vector and covariance matrix of $\bf x$ are defined as follows:
$${\bf m}_{\bf x} = \mathbb{E} ({\bf x}) \\
{\bf C}_{\...
2
votes
1
answer
584
views
Radius of convergence of cumulant generating function
Recall that for a random variable $X$ with a moment generating function $M_X(t)$ the cumulant generating function is defined as
\begin{align}
K_X(t)=\log M_X(t)
\end{align}
The Taylor expansion of $...
1
vote
1
answer
150
views
Is this (somewhat specific) moment problem treated somewhere?
Suppose I have a measure $\mu$ over $\mathbb R_+$ given by its moments $\mu_0,...,\mu_n$, defined as :
$$\mu_k = \int x^{k} \partial\mu(x),\; k \in 1,...,n$$
Using Faà di Bruno's formula, I can ...
2
votes
1
answer
385
views
Bounds on cumulants in terms of moments
I am interested in finding bounds on cumulants in terms of moments.
For example, this paper alludes to the bound
\begin{align}
|\kappa_n|\le n^n E[|X-E[X]|^n]
\end{align}
where $\kappa_n$ is the $n$-...
2
votes
0
answers
54
views
Cumulant of functions of weakly dependent random variables
Suppose $X_1,\dots,X_4$ are Gaussian random variables with mean and variance
$$\mathbf E X_i = 0,\quad \mathbf E X_i^2=1.$$
Furthermore suppose that the random variables have a certain weak ...
3
votes
3
answers
1k
views
Logarithm of the Fourier transform?
I've found this paper on the logarithm of the discrete fourier transform which proves that
$$
log F = 1/4 i \pi (I - (1 +i)F + F^2 - (1 - i)F^3)
$$
where $F$ is the unitary discrete Fourier ...
2
votes
0
answers
108
views
Arithmetic structure of non-zero cumulants
It is known that any non-Gaussian distribution must have infinitely many non-zero cumulants (Marcinkiewicz). I was wondering if something stronger is known about the structure of non-zero cumulants. ...
1
vote
0
answers
112
views
Existence of a Laplace transform that takes specific values on the integers
The classical Marcinkiewicz theorem (1939) states that if a random variable $X$ has a Laplace transform/characteristic function of the form $\mathbb{E}(e^{tX})=e^{P(t)} $ with $P$ a polynomial, then ...
4
votes
0
answers
91
views
Random variables whose expectations are cumulants
In my research I stumbled about the following class of random variables: Let $X_0,X_1,\dots$ be random variables on a common probability space with finite moments of all orders. We then define
\...
3
votes
0
answers
74
views
Finding analytic expressions for the cumulants of a correlated random variable
I am working with cumulants of a distribution. I have an example of how the second cumulant may be simplified from:
$k_2 = p\alpha^2\left\{\left(\sum a_i\right)^2 - 2\sum_{i<j}a_ia_j\left(1-\rho^{...
0
votes
1
answer
151
views
Can an unskewed distribution be expressed as product of a normal and another distribution?
Let $x$ be a continuous random variable with zero mean and zero skew. What are the conditions under which we can say that $x$ can be expressed as the product $z y$ where $z$ is a standard normal and $...
7
votes
0
answers
178
views
Joint cumulants of $Z_2^n$ characters
Let $f_{c}:Z_2^n \rightarrow \{-1,1\}$ be the character defined as $f_c(x) = (-1)^{<x,c>}$, where $c,x \in Z_2^n$. It is easy to see that since $f_{c_1}\cdot\ldots\cdot f_{c_k} = f_{c_1 \oplus \...
69
votes
6
answers
24k
views
What is a cumulant really?
A cumulant is defined via the cumulant generating function
$$ g(t)\stackrel{\tiny def}{=} \sum_{n=1}^\infty \kappa_n \frac{t^n}{n!},$$
where
$$
g(t)\stackrel{\tiny def}{=} \log E(e^{tX}).
$$
Cumulants ...
4
votes
0
answers
256
views
Is connected correlation/cumulant expansion additive?
Say X is a free field or a Gaussian random variable.
Then I want to analyse the connected correlation, $<(X + a (X^2 - \langle X^2 \rangle))^n>_c$
I think that for $n \geq 4$ there are no ...
7
votes
1
answer
1k
views
cumulant problem
A couple of days after I posted this to stackexchange, no one's answered:
I take the problem of cumulants to be this: given a sequence $(\kappa_1,\kappa_2,\kappa_3,\ldots)$ of real numbers, is it the ...
2
votes
0
answers
409
views
Generalizations of Gram-Charlier and Edgeworth series?
I am looking for references pertaining to, and/or help in deriving, generalizations of the Gram-Charlier and Edgeworth series for non-Gaussian reference probability distributions.
I would like to ...