stability.udach {agrostab}

R Documentation

Steadiness of stability index

Description

This function calculates the Udachin's parameters of stability

Usage

stability.udach(dataf, res_var, gen_var, env_var, rep_var, plotIt = TRUE)

Arguments

dataf	the name of the data frame containing the data to analyze.
res_var	the response variable.
gen_var	the genotypes variable.
env_var	the environments variable.
rep_var	the replications variable.
plotIt	a logical value specifying if plot should be drawn; default is TRUE

Value

Returns a data frame:

Ust

the genotype's Steadiness of stability index

intensity

the genotype's intensity value

max_val

the genotype's yield max value

min_val

the genotype's yield min value

S_opt

the genotype's standard deviation at optimal environment

S_lim

the genotype's standard deviation at limited environment

I_opt

the genotype's stability index at optimal environment

I_lim

the genotype's stability index at limited environment

References

Udachin R.A. 1990. Methods of assessing the ecological plasticity of wheat varieties. Selection and seed production. 5: 2-6. (In Russian)

Examples

data(exp_data)
stability.udach(exp_data,"yield","gen","env","rep")

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