# CI.percentile

0th

Percentile

##### Bootstrap confidence intervals

Bootstrap confidence intervals - percentile method or t interval.

Keywords
htest, nonparametric
##### Usage
CI.percentile(x, probs = c(0.025, 0.975), expand = TRUE, ...)
CI.t(x, probs = c(0.025, 0.975))
CI.bca(x, probs = c(0.025, 0.975), expand = TRUE, L = NULL, ...)
CI.bootstrapT(x, probs = c(0.025, 0.975))
##### Arguments
x
a bootstrap or bootstrap object.
probs
probability values, between 0 and 1. The default vector c(0.025, 0.975) gives a 95% two-sided interval.
expand
logical, if TRUE then use modified percentiles for better small-sample accuracy.
...
additional arguments to pass to quantile.resample and quantile.
L
vector of length n, empirical influence function values. If not supplied this is computed using jackknife.
##### Details

CI.bootstrapT assumes the first dimension of the statistic is an estimate, and the second is proportional to a SE for the estimate. E.g. for bootstrapping the mean, they could be the mean and s. This is subject to change.

CI.bca and CI.bootstrapT currently only support a single sample.

##### Value

a matrix with one column for each value in probs and one row for each statistic.

##### References

This discusses the expanded percentile interval: Hesterberg, Tim (2014), What Teachers Should Know about the Bootstrap: Resampling in the Undergraduate Statistics Curriculum, http://arxiv.org/abs/1411.5279.

##### See Also

bootstrap, bootstrap2, ExpandProbs (for the expanded intervals).

##### Aliases
• CI.percentile
• CI.t
• CI.bca
• CI.bootstrapT
##### Examples
## Not run:
# # See full set of examples in resample-package, including different
# # ways to call all four functions depending on the structure of the data.
# data(Verizon)
# CLEC <- with(Verizon, Time[Group == "CLEC"])
# bootC <- bootstrap(CLEC, mean, seed = 0)
# bootC2 <- bootstrap(CLEC, c(mean = mean(CLEC), sd = sd(CLEC)), seed = 0)
# CI.percentile(bootC)
# CI.t(bootC)
# CI.bca(bootC)
# CI.bootstrapT(bootC2)
# ## End(Not run)

Documentation reproduced from package resample, version 0.4, License: BSD_3_clause + file LICENSE

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