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User 2014
  • Member for 9 years, 2 months
  • Last seen more than 3 years ago
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19
Show that the multinomial distribution has covariances ${\rm Cov}(X_i,X_j)=-r p_i p_j$
Feb 24, 2016
8
Are the random variables $X + Y$ and $X - Y$ independent if $X, Y$ are distributed normal?
Jan 25, 2016
4
How can I prove this theorem about integrals?
Jun 12, 2015
4
Mean of pure birth process with distinct birth rates when odd and when even
Nov 15, 2016
3
How can I prove that $\frac{x}{x^2 - 4}$is invertible?
Jan 22, 2016
2
How to prove this limit's equality?
May 10, 2015
2
How can I solve this improper integral?
Jun 19, 2015
2
Proving $\sum_{k=1}^\infty \rightarrow -\infty$ almost surely if $P(X_k=k^2)=\frac{1}{k^2}=p_k, P(X_k=-1)=1-p_k$.
May 28, 2020
2
Distribution of order statistics
Feb 22, 2016
2
Computing $E[X]$ for $s(x)=(1-x)^n I_{(0,1)}(x)$
Nov 28, 2016
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How to add subfigure in R markdown (bookdown)