variance_of_rank {toolStability} | R Documentation |
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 |
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
Nassar R, Hühn M (1987). “Studies on estimation of phenotypic stability: Tests of significance for nonparametric measures of phenotypic stability.” Biometrics, 43(1), 45–53. ISSN 0006-341X.
Examples
data(Data)
variance.of.rank <- variance_of_rank(
data = Data,
trait = "Yield",
genotype = "Genotype",
environment = "Environment",
unit.correct = FALSE)