popKorn (version 0.3-0)

asymmetricIntervals: Compute Asymmetric Intervals

Description

This function will compute asymmetric intervals for the mean of the selected populations.

Usage

asymmetricIntervals(X, alpha = 0.05, k = 2, var = NULL, eps = 0.1)

Arguments

X

is a matrix or data frame that contains the responses. Each column represents a different population.

alpha

denotes the significance level of the intervals to be formed.

k

corresponds to the number of populations to be selected.

var

denotes the common variance of the populations from which the data is drawn. If this is NULL (the default), then the variance will be estimated from the data. If it is known, then it should be provided as a scalar.

eps

The grid size that is to be set up.

Value

This function returns a matrix with k rows and 3 columns. This is similar to the output of the predict.lm function of R.

Details

This function will compute the optimal lambda and c to be used to shrink the interval for the selected populations.

References

Claudio Fuentes, George Casella and Martin Wells (2013). Interval estimation for the mean of the selected populations (Submitted).

Vik Gopal and Claudio Fuentes (2013). kPop: An R package for interval estimation of selected populations. useR! 2013.

See Also

bonferroniIntervals, bootstrapIntervals

Examples

set.seed(18)
p <- 10; n <- 10
Xmat <- matrix(rnorm(p*n), nrow=n, ncol=p)
colnames(Xmat) <- paste("p.", 1:p, sep="")
asymmetricIntervals(Xmat, alpha=0.1, k=4)