phenability (version 2.0)

nahu: Nassar and Huehn Function

Description

Performs a stability analysis based on Nassar and Huehn (1987) and, Huehn (1979) statistics. the four nonparametric measures of phenotypic stability are: S1 (mean of the absolute rank differences of a genotype over the n environments), S2 (variance among the ranks over the k environments), S3 (sum of the absolute deviations), and S6 (relative sum of squares of rank for each genotype).

Usage

nahu(data, interaction=FALSE)

Arguments

nahu

nahu function

data

A numeric data.frame with fenotypic means values of MET, and genotypes and environments by rows and columns, respectively.

interaction

do a interaction plot or not (FALSE = no interaction plot output, TRUE = draws a interaction plot between genotypes and environments).

Value

Is returned a list with four numerical statistics values (S1, S2, S3, and S6) by genotype, the ranking for the response variable in each environment, and the Spearman correlation matrix between environments.

References

Nassar, R., and M. Huehn. 1987. Studies on estimation of phenotypic stability: Tests of significance for nonparametric measures of phenotypic stability. Biometrics 43:45.

Huehn, V.M. 1979. Beitrage zur erfassung der phanotypischen stabilitat. EDV Med. Biol. 10:112.

Examples

require("phenability")
data(bean.data)
bean.data
x <- bean.data

nahu(x, interaction = TRUE)