inst/doc/a-tutorial.R

In geneticae: Statistical Tools for the Analysis of Multi Environment Agronomic Trials

## ---- include = FALSE---------------------------------------------------------
knitr::opts_chunk$set(warning = F, message = F, out.width = "60%")
library(dplyr)

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#  install.packages("geneticae")

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#  # install.packages("devtools")
#  devtools::install_github("jangelini/geneticae")

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library(geneticae)

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library(agridat)
data(yan.winterwheat)
head(yan.winterwheat)

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data(plrv)
head(plrv)

## ---- fig.align='center', fig.cap='Figure 1: GE biplot based on yield data of 1993 Ontario winter wheat performance trials.  The 71.66% of GE variability is explained by the first two multiplicative terms. Cultivars are shown in lowercase and environments in uppercase.'----
rAMMI(yan.winterwheat, genotype = "gen", environment = "env", 
      response = "yield", type = "AMMI", footnote = F, titles = F)

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GGE1 <- GGEmodel(yan.winterwheat, genotype = "gen", environment = "env", 
                 response = "yield")

## ---- fig.align='center', fig.cap='Figure 2: GGE biplot based on yield data of 1993 Ontario winter wheat performance trials. The scaling method used is symmetrical singular value partitioning (by default). The 78% of G + GE variability is explained by the first two multiplicative terms. Cultivars are shown in lowercase and environments in uppercase.'----
GGEPlot(GGE1, type = "Biplot", footnote = F, titles = F)

## ---- fig.align='center', fig.cap='Figure 3: comparison of cultivar performance in a selected environment (OA93). The scaling method used is symmetrical singular value partitioning (by default). The 78% of G + GE variability is explained by the first two multiplicative terms.'----
GGEPlot(GGE1, type = "Selected Environment", selectedE = "OA93", 
        footnote = F, titles = F)

## ----  fig.align='center', fig.cap='Figure 4: comparison of the performance of cultivar Luc in different environments. The scaling method used is symmetrical singular value partitioning (by default). The 78% of G + GE variability is explained by the first two multiplicative terms. '----
GGEPlot(GGE1, type = "Selected Genotype", selectedG = "Kat", 
        footnote = F, titles = F)

## ----  fig.align='center', fig.cap='Figure 5: comparison of the cultivars _Kat_ and _Cas_. The scaling method used is symmetrical singular value partitioning (by default). The 78% of G + GE variability is explained by the first two multiplicative terms. Cultivars are shown in lowercase and environments in uppercase.'----
GGEPlot(GGE1, type = "Comparison of Genotype", 
        selectedG1 = "Kat", selectedG2 = "Cas", 
        footnote = F, titles = F, axis_expand = 1.5)

## ----  fig.align='center', fig.cap='Figure 6: polygon view of the GGE biplot, showing which cultivars presented highest yield in each environment. The scaling method used is symmetrical singular value partitioning (by default). The 78% of G + GE variability is explained by the first two multiplicative terms. Cultivars are shown in lowercase and environments in uppercase.'----
GGEPlot(GGE1, type = "Which Won Where/What", footnote = F,
        titles = F, axis_expand = 1.5)


## ----  fig.align='center', fig.cap='Figure 7: average environment view of the GGE biplot based on genotype-focused scaling, showing mean yield and stability of genotypes. '----
data <- yan.winterwheat[yan.winterwheat$env %in% c("BH93", "EA93","HW93", "ID93",
                                                   "NN93", "RN93", "WP93"), ]
data <- droplevels(data)
GGE2 <- GGEmodel(data, genotype = "gen", environment = "env", 
                 response = "yield", SVP = "row")

GGEPlot(GGE2, type = "Mean vs. Stability", footnote = F, titles = F, sizeEnv = 0)

## ----  fig.align='center', fig.cap='Figure 8: Classification of genotypes with respect to the ideal genotype. Genotype-focused scaling is used.', warning=FALSE----
GGEPlot(GGE2, type = "Ranking Genotypes", footnote = F, titles = F, sizeEnv = 0)

## ----  fig.align='center', fig.cap='Figure 9: Relationship between environments. Environment-focused scaling is used.'----
GGE3 <- GGEmodel(data, genotype = "gen", environment = "env", 
                 response = "yield", SVP = "column")
GGEPlot(GGE3, type = "Relationship Among Environments", footnote = F, titles = F)

## ----  fig.align='center', fig.cap='Figure 10: classification of environments with respect to the ideal environment. Environment-focused scaling is used.'----
GGEPlot(GGE3, type = "Ranking Environments", footnote = F, titles = F)

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# Generating missing data
yan.winterwheat[1,3] <- NA
yan.winterwheat[3,3] <- NA
yan.winterwheat[2,3] <- NA

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imputation(yan.winterwheat, nPC = 2, genotype = "gen", environment = "env", 
           response = "yield", type = "EM-AMMI")

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sessionInfo()