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user103828
  • Member for 10 years, 6 months
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20 votes
2 answers
7k views

Converse of mean value theorem

13 votes
3 answers
5k views

Is statistical dependence transitive?

13 votes
1 answer
5k views

Inverse matrix and its zero entries

6 votes
2 answers
754 views

Solving the PDE $u_{tt}+2u_{tx}+u_{xx}=2c$

6 votes
2 answers
205 views

Decomposing $Y=U_1+U_2$ so that $\operatorname{Cov}(U_1,X\mid Z)=0$ and $\operatorname{Cov}(U_2,X\mid Z)=\operatorname{Cov}(U_2,X)$

5 votes
1 answer
7k views

Explicit formula for inverse matrix elements

4 votes
1 answer
3k views

Differences Exponential and Ordinary Generating Functions

4 votes
0 answers
807 views

Convergence rate of an estimator

4 votes
1 answer
999 views

Uniqueness of homogeneous Fredholm equation of the first kind

4 votes
1 answer
1k views

Estimating the expectation of a derivative

4 votes
1 answer
4k views

Understanding the determinant of an infinite matrix

3 votes
1 answer
80 views

Relationship between distribution and covariance

3 votes
1 answer
206 views

Estimating derivatives with randomness

3 votes
1 answer
137 views

Find all solutions of $f$ such that $ \operatorname{Cov}(f(x),x)=c $ where $x \sim N(\mu,\sigma^2)$ and $c$ does not depend on $(\mu,\sigma^2)$

3 votes
2 answers
117 views

When is $\sum_{N=1}^{\infty}\exp\left(\ln\left(\frac{\sqrt{N}\ln(N)}{g(N)}\right)-\frac{(g(N))^2}{\ln(N)}\right)<\infty$?

2 votes
3 answers
349 views

Does an induction argument work when $n \rightarrow \infty$?

2 votes
1 answer
233 views

Choose $n$ objects with replacement from a bag with $n$ objects

2 votes
1 answer
158 views

Does mean zero imply integrability?

2 votes
1 answer
660 views

Do we need to check that maximum likelihood estimator is a maximum?

2 votes
1 answer
612 views

Is a density function integrable?

2 votes
1 answer
402 views

Binomial expansion (sort of ) rearrangement

2 votes
2 answers
1k views

The sum of a positive definite matrix and small symmetric matrix

2 votes
1 answer
80 views

Solutions to functional equation $f(at+x)+g(x)+h(t,bt+x) =0 $

1 vote
1 answer
2k views

Sum of dependent normal random variables

1 vote
1 answer
781 views

Are the product and ratio of two characteristic functions still characteristic functions?

1 vote
1 answer
257 views

Solutions to functional equation $f(x_1,x_2)+g(a_1t+x_1,a_2t+x_2)+h(b_1t+x_1,b_2t+x_2) = t^2$

1 vote
1 answer
290 views

Uniqueness of Pexider's functional equation

1 vote
1 answer
208 views

Does $E[XY|Z]=E[XY]$?

1 vote
1 answer
234 views

Is a vector a multiple of some other vector?

1 vote
1 answer
406 views

Can the characteristic function of a multivariate normal distribution be extended from a neighborhood of the origin?