Performs a stability analysis based on the geometric mean (GAI), according to the following model:
$$GAI = \sqrt[E]{{{{\bar Y}_{1.}} \cdot {{\bar Y}_{2.}} \cdot ... \cdot {{\bar Y}_{i.}}}}$$
Usage
gai(.data, env, gen, rep, resp, verbose = TRUE)
Arguments
.data
The dataset containing the columns related to Environments,
Genotypes, replication/block and response variable(s).
env
The name of the column that contains the levels of the
environments.
gen
The name of the column that contains the levels of the genotypes.
rep
The name of the column that contains the levels of the
replications/blocks.
resp
The response variable(s). To analyze multiple variables in a
single procedure use, for example, resp = c(var1, var2, var3).
verbose
Logical argument. If verbose = FALSE the code will run
silently.
Value
An object of class gai, which is a list containing the results
for each variable used in the argument resp. For each variable, a
tibble with the following columns is returned.
GEN the genotype's code.
GAI Geometric adaptability index
GAI_R The rank for the GAI value.
References
Shahbazi, E. 2019. Genotype selection and stability analysis for
seed yield of Nigella sativa using parametric and non-parametric
statistics. Sci. Hortic. (Amsterdam). 253:172-179.
doi:10.1016/j.scienta.2019.04.047.