variance_of_rank: variance of rank

In toolStability: Tool for Stability Indices Calculation

variance of rank

Description

variance_of_rank calculate variance of a genotype across environments.

Usage

variance_of_rank(data, trait, genotype, environment, unit.correct = FALSE)

Arguments

data	a dataframe containing trait, genotype and environment.
trait	colname of a column containing a numeric vector of interested trait to be analysized.
genotype	colname of a column containing a character or factor vector labeling different genotypic varieties
environment	colname of a column containing a character or factor vector labeling different environments
unit.correct	logical, default is FALSE, returning the stability index with unit equals to squared unit of trait; when TRUE, returning stability index with the unit as same as unit of trait.#'

Details

Variance of rank (Nassar and Huehn, 1987) is calculatd based on regression function. Variety with low variance of rank is considered as stable. Equation of variance of rank can be found in vignette file.

Value

a data table with variance of rank

Author(s)

Tien-Cheng Wang

References

\insertRef

nassar1987toolStability

Examples

data(Data)
variance.of.rank <- variance_of_rank(
 data = Data,
 trait = "Yield",
 genotype = "Genotype",
 environment = "Environment",
 unit.correct = FALSE)

toolStability documentation built on March 31, 2023, 11:50 p.m.