bootstrap function

Bootstrap

Simplified version of the boot function.

bootstrap(x, fun, nrep = 1000, conf.level = 0.95, ...)

Arguments

• x: numeric vector.
• fun: function to be used for computation (function(x,i) ...(x[i])).
• nrep: number of replicates.
• conf.level: confidence level for confidence interval.
• ...: additional arguments to boot. See help of this function.

Details

See help of the boot function for more explanations.

Returns

• method: the character string "Bootstrap"

• data.name: a character string giving the name of the data.

• estimate: the estimated original value

• conf.level: confidence level for confidence interval.

• rep: number of replicates.

• conf.int: limits of the confidence interval.

Author(s)

Maxime HERVE maxime.herve@univ-rennes1.fr

See Also

boot

Examples

# Confidence interval of a mean
samp <- sample(1:50,10,replace=TRUE)
bootstrap(samp,function(x,i) mean(x[i]))

# Confidence interval of the standard error of the mean
bootstrap(samp,function(x,i) sd(x[i])/sqrt(length(x[i])))