| 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")