ciJack: Jackknife confidence intervals

In fullfact: Full Factorial Breeding Analysis

Jackknife confidence intervals

Description

Extracts jackknife confidence intervals for additive genetic, non-additive genetic, and maternal variance components.

Usage

ciJack(comp, full, level = 95, rnd_r = 3, rnd_p = 1, trait = NULL)

Arguments

comp	Data frame of jackknife resampling results.
full	A vector of raw observed additive, non-additive, maternal, and total variance component values for from the full observed data set, i.e. c(additive, non-additive, maternal, total).
level	Confidence level, as a percentage. Default is 95.
rnd_r	Number of decimal places to round the confidence interval of raw values.
rnd_p	Number of decimal places to round the confidence interval of percentage values.
trait	Optional label for the phenotypic trait.

Details

Used for jackknife resampling results produced using JackLmer for normal data or JackGlmer for non-normal data. Jackknife confidence intervals, using pseudo-values are described by Efron and Tibshirani (1993). The standard errors are calculated from the pseudo-values and the Student's t distribution is used to provide the lower and upper confidence values. For delete-d jackknife resampling, M degrees of freedom are used for producing the confidence interval (Martin et al. 2004): M = N / d, where N is the total number of observations and d is the number of deleted observations. That is, M is the number of row in the jackknife resampling results. Large values of M, such as 1,000, can translate to the delete-d jackknife resampling method approaching bootstrap resampling expectations (Efron & Tibshirani 1993).

Value

Prints a data frame containing the lower, median, and upper values of the jackknife confidence interval for additive genetic, non-additive genetic, and maternal variance components. Values are presented as raw and percentages of the total variance value within each row.

References

Efron B, Tibshirani R. 1993. An introduction to the Bootstrap. Chapman and Hall, New York.

Martin, H., Westad, F. & Martens, H. (2004). Imporved Jackknife Variance Estimates of Bilinear Model Parameters. COMPSTAT 2004 – Proceedings in Computational Statistics 16th Symposium Held in Prague, Czech Republic, 2004 (ed J. Antoch), pp. 261-275. Physica-Verlag HD, Heidelberg.

See Also

ciJack2, ciJack3

Examples

data(chinook_jackL) #Chinook salmon offspring length, delete-one jackknife
ciJack(chinook_jackL,c(0,0.7192,0.2030,1.0404))

fullfact documentation built on May 29, 2024, 1:21 a.m.