anova_joint {metan}

Joint analysis of variance

Description

Performs a joint analysis of variance to check for the presence of genotype-vs-environment interactions using both randomized complete block and alpha-lattice designs.

Usage

anova_joint(.data, env, gen, rep, resp, block = NULL, 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. The analysis of variance is computed for each level of this factor.

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 a vector of variables may be used. For example resp = c(var1, var2, var3).

block

Defaults to NULL. In this case, a randomized complete block design is considered. If block is informed, then a resolvable alpha-lattice design (Patterson and Williams, 1976) is employed. All effects, except the error, are assumed to be fixed.

verbose

Logical argument. If verbose = FALSE the code will run silently.

Value

A list where each element is the result for one variable containing the following objects:

• anova: The two-way ANOVA table

• model: The model of class lm.

• augment: Information about each observation in the dataset. This includes predicted values in the fitted column, residuals in the resid column, standardized residuals in the stdres column, the diagonal of the 'hat' matrix in the hat, and standard errors for the fitted values in the se.fit column.

• details: A tibble with the following data: Ngen, the number of genotypes; OVmean, the grand mean; Min, the minimum observed (returning the genotype and replication/block); Max the maximum observed, MinGEN the loser winner genotype, MaxGEN, the winner genotype.

Author(s)

Tiago Olivoto [e-mail]

References

Patterson, H.D., and E.R. Williams. 1976. A new class of resolvable incomplete block designs. Biometrika 63:83-92.

See Also

get_model_data() anova_ind()

Examples

library(metan)
# traditional usage approach
j_an <- anova_joint(data_ge,
                    env = ENV,
                    gen = GEN,
                    rep = REP,
                    resp = everything())
# Predicted values
get_model_data(j_an)

# Details
get_model_data(j_an, "details")