Coefficient of determination

coefficient_of_determination calculate variance of a genotype across environments.

coefficient_of_determination(data, trait, genotype, environment)

Arguments

data

a dataframe containing trait, genotype and environment.

trait

colname of a column containing a numeric vector of interested trait to be analysized.

genotype

colname of a column containing a character or factor vector labeling different genotypic varieties

environment

colname of a column containing a character or factor vector labeling different environments

Value

a data table with coefficient of determination

Details

Coefficient of determination (Pinthus, 1976) is calculatd based on regression function. Variety with low coefficient of determination is considered as stable. Equation of coefficient of determination can be found in vignette file.

References

Pinthus MJ (1973). “Estimate of genotypic value: A proposed method.” Euphytica, 22(1), 121--123. ISSN 1573-5060, doi: 10.1007/BF00021563 .

Author

Tien-Cheng Wang

Examples

data(Data)
coef.of.determination <- coefficient_of_determination(
 data = Data,
 trait = "Yield",
 genotype = "Genotype",
 environment = "Environment")