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The bootstrap is a resampling method to estimate the sampling distribution of a statistic.
4
votes
Accepted
Parametric bootstrap : examples
(The lack of a pivotal quantity also makes it hard to construct exchangeable quantities suitable for the more usual kinds of bootstrap.) …
6
votes
Are there problems with arbitrary application of bootstrap?
The term "bootstrap" covers many (somewhat related) things -- enough to fill a number of books (which indeed it does). Some things are more prone to problems with naive application than others. … If you have a model for the way the expectation moves, the way the variance changes and the dependence over time, you might be able to do something like block-bootstrap the residuals, say. …
5
votes
Accepted
Expected proportion of the sample when bootstrapping
This is related to collision-counting in the birthday problem.
Imagine you walk into a room of $k$ people. The probability at least one shares a birthday with you is $q(k;n) = 1 - \left( \frac{n-1}{ …
2
votes
What is iterative bootstrap? How is it used?
In a great many cases, however, asymptotic and bootstrap P values are quite different. … In this paper, we discuss
techniques for computing modified bootstrap P values which will tend to be similar
to the ordinary bootstrap P value when the latter is reliable, but which should often …
44
votes
Accepted
Why on average does each bootstrap sample contain roughly two thirds of observations?
Immediately, we have the result at the top of this answer, $\lim_{n\to\infty}(1- 1/n)^n=e^{-1}$
As gung points out in comments, the result in your question is the origin of the 632 bootstrap rule … Tibshirani (1997),
"Improvements on Cross-Validation: The .632+ Bootstrap Method,"
Journal of the American Statistical Association Vol. 92, No. 438. (Jun), pp. 548-560 …
0
votes
Accepted
parametric bootstrap on a normal distribution
Because we cannot do that, we use bootstrap.
We bootstrap using something close to the true distribution. But which kind of closeness is more important in a particular simulation? …
0
votes
Is there an inductive version of a traditional hypothesis test?
If you compare a hypothesized value with a bootstrapped confidence interval for a parameter, you'd be comparing a hypothesized value to a confidence interval based on an empirical distribution from bo …
7
votes
Accepted
Bootstrapping approach: how is the resampled sample chosen?
So, how is the new sample different from the original one? I don't have a huge background in statistic so please be plain.
Sampling is with replacement.
Imagine you have a sample of size 30. Tak …
1
vote
Accepted
Why do we use superscript notation and asterisks when describing bootstrap samples?
Sometimes you will see two used when the bootstrap samples are in turn resampled.
Since there are many bootstrap samples, you need a way to indicate which one you're referring to. … For example, if you want to write how to compute some statistic across samples, you need some way to indicate the $k$-th bootstrap sample (say). …
5
votes
Accepted
Working with the bootstrap sample vs the original sample
You're using the bootstrap to try to get at the sampling distribution of the sample mean, by using the resampling distribution to approximate it. …
4
votes
Why residual bootstrap does not work for GLM?
It won't work with raw residuals for several reasons, but arguably can work - at least for some cases - with other choices. E.g pearson residuals can take care of the heteroskedasticity issue.
Other c …
6
votes
Why is it ok to mix up the order of the time series in a moving block bootstrap?
Note that the overlapping block bootstrap is not the only block-bootstrap method. My comments should apply to the other forms as well. …
2
votes
Accepted
How many observations are taken for a pseudo-sample when bootstrapping?
observations* (the original data has more digits):
x y
1 1.66 3.64
2 5.30 4.91
3 4.75 5.32
4 2.07 1.58
5 2.88 4.25
6 3.53 4.59
7 1.75 2.37
8 1.42 2.10
9 2.82 4.35
10 1.81 3.90
and I want to bootstrap … *(ten is much too few for the bootstrap to be much use, but this is just for illustration)
The idea is to resample the data - by sampling rows (with replacement) from the original data to obtain new pseudo-samples …
3
votes
Finding the mean of right-censored values
The bootstrap (alone) will not help you identify the mean in the presence of censoring, and will not be much use with the median given a dataset like the one you supplied; you may be able to get some kind … of lower bound on the median in this case with a bootstrap, but you can do that nonparametrically without the need for bootstrapping. …
22
votes
Accepted
Why is power of a hypothesis test a concern when we can bootstrap any representative sample ...
What varies is the number of such bootstrap resamples. … Increasing the number of bootstrap samples gives a more "accurate" sense of that approximation, but it doesn't add any information that wasn't already there. …