stability_analysis: Stability Analysis using Eberhart-Russell Model

In CropBreeding: Stability Analysis in Crop Breeding

Stability Analysis using Eberhart-Russell Model

Description

This function performs stability analysis for multiple traits across different environments using Eberhart and Russell's regression model provided by the 'metan' package. It computes ANOVA tables and regression parameters for assessing genotype stability.

Usage

stability_analysis(
  data,
  genotype_col,
  environment_col,
  replication_col,
  trait_cols
)

Arguments

data	A data frame containing the dataset with required columns.
genotype_col	Character. Name of the genotype column.
environment_col	Character. Name of the environment column.
replication_col	Character. Name of the replication column.
trait_cols	A vector of trait column names (response variables).

Value

A list containing results for each trait:

• 'anova': The ANOVA table for each trait.

• 'regression': Regression parameters for stability analysis.

References

Eberhart, S. A., & Russell, W. A. (1966). "Stability Parameters for Comparing Varieties". Crop Science, 6(1), 36–40. doi:10.2135/cropsci1966.0011183X000600010011x

Examples

if (!requireNamespace("metan", quietly = TRUE)) {
  install.packages("metan")
}
library(metan)

# Simulated dataset
set.seed(123)
data <- data.frame(
  Genotype = rep(c("G1", "G2", "G3"), each = 12),
  Environment = rep(c("E1", "E2", "E3", "E4"), times = 9),
  Replication = rep(1:3, times = 12),
  Trait1 = c(rnorm(36, 50, 5)),
  Trait2 = c(rnorm(36, 150, 10)),
  Trait3 = c(rnorm(36, 250, 15))
)

results <- stability_analysis(
  data = data,
  genotype_col = "Genotype",
  environment_col = "Environment",
  replication_col = "Replication",
  trait_cols = c("Trait1", "Trait2", "Trait3")
)

print(results$Trait1$anova)
print(results$Trait1$regression)

CropBreeding documentation built on April 4, 2025, 4:43 a.m.