eda4treeR (version 1.1.0)

Exam8.1.1: Example 8.1.1 from Experimental Design and Analysis for Tree Improvement

Description

Exam8.1.1 presents the Mixed Effects Analysis of Diameter at breast height (Dbh) of 60 SeedLots under layout of row column design with 6 rows and 10 columns in 18 countries and 59 provinces of 18 selected countries given in Example 8.1.

Author

1. Muhammad Yaseen ()

2. Sami Ullah ()

References

1. E.R. Williams, C.E. Harwood and A.C. Matheson (2023). Experimental Design and Analysis for Tree Improvement. CSIRO Publishing (https://www.publish.csiro.au/book/3145/).

See Also

DataExam8.1

Examples

library(car)
library(dae)
library(dplyr)
library(emmeans)
library(ggplot2)
library(lmerTest)
library(magrittr)
library(predictmeans)

data(DataExam8.1)

# Pg. 155
fm8.8 <-
 lmerTest::lmer(
     formula = dbh ~ 1 + repl + col + prov +
                     (1|repl:row) + (1|repl:col)
   , data   = DataExam8.1
   , REML   = TRUE
   )

# Pg. 157
if (FALSE) {
varcomp(fm8.8)
}

anova(fm8.8)
anova(fm8.8, ddf = "Kenward-Roger")

predictmeans(model = fm8.8, modelterm = "repl")
predictmeans(model = fm8.8, modelterm = "col")
predictmeans(model = fm8.8, modelterm = "prov")

 # Pg. 161
  RCB1 <-
        aov(dbh ~ prov + repl, data = DataExam8.1)
  RCB  <-
        emmeans(RCB1,  specs = "prov") %>%
        as_tibble()

  Mixed <-
          emmeans(fm8.8, specs = "prov") %>%
          as_tibble()

  table8.9 <-
      left_join(
         x      = RCB
       , y      = Mixed
       , by     = "prov"
       , suffix = c(".RCBD", ".Mixed")
       )
  print(table8.9)