stability_variance {toolStability} | R Documentation |
stability_variance
calculate variance of a genotype across environments.
stability_variance(data, trait, genotype, environment, unit.correct = FALSE)
data |
a dataframe containing trait, genotype and environment. |
trait |
colname of a column containing a numeric vector of interested trait to be analyzed. |
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 |
Stability variance (Shukla, 1972) is calculatd based on lindear combination of ecovalence and mean square of genotype-environment interaction. Variety with low stability variance is considered as stable. Negative values of stability variance is replaced with 0. Equation of stability variance can be found in vignette file.
a data table with stability variance
Tien-Cheng Wang
Shukla GK (1972). “Some statistical aspects of partitioning genotype environmental components of variability.” Heredity, 29(2), 237–245.
data(Data)
stability.variance <- stability_variance(
data = Data,
trait = "Yield",
genotype = "Genotype",
environment = "Environment")