The function computes the Shukla's stability variance parameter (1972) and uses the Kang's nonparametric stability (rank sum) to imcorporate the mean performance and stability into a single selection criteria.
Shukla(.data, env, gen, rep, resp, verbose = TRUE)
The dataset containing the columns related to Environments, Genotypes, replication/block and response variable(s).
The name of the column that contains the levels of the environments.
The name of the column that contains the levels of the genotypes.
The name of the column that contains the levels of the replications/blocks.
The response variable(s). To analyze multiple variables in a
single procedure use, for example,
Logical argument. If
An object of class
Shukla, 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.
Y the mean for the response variable.
ShuklaVar The Shukla's stability variance parameter.
rMean The rank for Y (decreasing).
rShukaVar The rank for ShukaVar.
ssiShukaVar The simultaneous selection index (\(ssiShukaVar = rMean + rShukaVar\)).
Shukla, G.K. 1972. Some statistical aspects of partitioning genotype-environmental components of variability. Heredity. 29:238-245. doi: 10.1038/hdy.1972.87
Kang, M.S., and H.N. Pham. 1991. Simultaneous Selection for High Yielding and Stable Crop Genotypes. Agron. J. 83:161. doi: 10.2134/agronj1991.00021962008300010037x
Tiago Olivoto firstname.lastname@example.org