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6 votes
2 answers
2k views

What is the expected length of an iid sequence that is monotonically increasing when drawn from a uniform [0,1] distribution?

Overall question: Assume X$_i$ ~ i.i.d. Unif(0,1). What is the expected length of a sequence that is monotonically increasing when drawn from the distribution? The skeleton of the solution is $$ \...
Amazonian's user avatar
  • 1,554
4 votes
3 answers
259 views

pdf of $Z_{(n)}/Z_{(1)}$, where $Z \sim \text{Exponential}(1)$, i.i.d. (order statistics)

Let $Z_i \sim \text{Exponential}(1)$, iid, $i=1,2, ..., n$ and let $Z_{(i)}$ be the $i^{\text{th}}$ order statistic. How can I find the pdf of $T=Z_{(n)}/Z_{(1)}$? (the ratio of maximum and minimum ...
456 123's user avatar
  • 467
1 vote
1 answer
63 views

How to combine two integrals containing the PDFs of a variable and its linear transform?

Original Post: Suppose we have two random variables $X$ and $Y$ with cumulative distribution functions $F(x)$ and $G(y)$. We know that $Y = aX + b$. I want to compute $Z(x) = F(x) - G(y)$. What I have ...
Philipp's user avatar
  • 13