# Questions tagged [bootstrap-sampling]

Use this tag for questions related to a statistical test or metric that relies on random sampling with replacement.

33 questions
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### why bootstrap re-sampling size is same as length of the original sample

a non-parametric bootstrap: let $𝑥=(𝑥_1,…,𝑥_𝑛 )\overset{i.i.d}{\sim}𝐹$ and $F$ is unknown steps 1)Fix the number of bootstrap re-samples B. 2)Sample a new data set $𝑥^∗$ set of size $𝑛$ ...
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### Bootstrap - percentage of items that are not selected [duplicate]

Why is percentage of items that are not selected in Bootstrap method $\frac{1}{e} \approx 37 \%$? It is related to Bootstrap-related issue . Thank you
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### Bayesian bootstrap : is this correct?

So my problem is as follow : I have a given string of characters, and I would like to quantify the uncertainty linked to the probability of each letter types in the string, based on there observed ...
0answers
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### Sampling distribution of a functional T

While studying the bootstrap method, I came across with the following definition of the sampling distribution of a functional T: Let's say $X_1,...,X_n$ are i.i.d with distribution function $F$, then ...
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### Test for difference of variances in populations with different means

I have two samples A and B, both of size 72, drawn from two different populations. I do not know anything about the population, only that they are non normal at all. I want to know the probability ...
1answer
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### Why is a bootstrap method helping in some way?

The general methods with bootstrapping is always similar to that: We have a given sample $x_1,...,x_n$. Then we pick some elements of the sample randomly and put it then back to the sample; This ...
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### Why is good to use bootstrapping samples?

I was researching a little about one algorithm called Random Forest, since it use bootstrapping samples, I mean it constructs several samples with replacement from a set, one question came to me, Why ...
1answer
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### When is the bootstrap sampling method not applicable?

I have used once the bootstrap sampling method to obtain a confidence interval for the expected daily returns that I had calculated using some data given. As far as I have understood, this method can ...