phenability (version 2.0)

phenability-package: Nonparametric Stability Analysis

Description

An alternative to carrying out phenotypic adaptability and stability analysis, taking into account nonparametric statistics. Can be used as a robust approach, and less sensitive to departures from common genotypic, environmental, and GxE effects data assumptions (e.g., normal distribution of errors).

Arguments

function

nahu, kang, fox, or thsu

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).

Details

Package:

phenability

Type:

Package

Version:

2.0

Date:

2015-02-24

License:

GPU-3

The package can be applied to MET (multienvironment trials) data containing the phenotypic mean of genotype x environment (dataframe with genotypes by rows and environments into columns) and performs nonparametric analysis according to for criteria: Huehn (1979), and Nassar and Huehn (1987); Kang's (1988); Fox et al. (1990) and; Thennarasu's (1995).

References

Fox, P.N., B. Skovmand, B.K. Thompson, H.J. Braun, and R. Cormier. 1990. Yield and adaptation of hexaploid spring triticale. Euphytica 47:57.

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

Kang, M.S. 1988. A ranksum method for selecting high yielding, stable corn genotypes. Cereal Res. Comm. 16:113.

Lin, C.S., and M.R. Binns. 1994. Concepts and methods for analyzing regional trial data for cultivar and location selection. Plant Breed. Rev. 12:271.

Lin, C.S., M.R. Binns, and L.P. Lefkovitch. 1986. Stability analysis: Where do we stand? Crop Sci. 26:894.

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

Shukla, G.K. 1972. Some aspects of partitioning genotype environmental components of variability. Heredity 28:237.

Thennarasu, K. 1995. On certain nonparametric procedures for studying genotype x environment interactions and yield stability. Ph.D. thesis. P.J. School, IARI, New Delhi, India.

Examples

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

fox(x)
fox(x, interaction=TRUE)

kang(x)
kang(x, interaction=TRUE)

thsu(x)
thsu(x, interaction=TRUE)

nahu(x)
nahu(x, interaction=TRUE)