Randomized Complete Block Designs (RCBD)

Experimenteel ontwerp in R

Joanne Xiong

Data Scientist

RCBD's

Randomized - de behandeling wordt per blok willekeurig toegewezen
Complete - elke behandeling komt even vaak voor in elk blok
Block - experimentele groepen worden geblokt om vergelijkbaar te zijn (bijv. op geslacht)
Design - dit is jouw experiment!

RCBD-werkstroom

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agricolae

library(agricolae)
trt <- letters[1:4]
rep <- 4
design.rcbd <- design.rcbd(trt,
                           r = rep,
                           seed = 42,
                           serie = 0)
design.rcbd$sketch

     [,1] [,2] [,3] [,4]
[1,] "d"  "c"  "a"  "b" 
[2,] "b"  "a"  "d"  "c" 
[3,] "d"  "a"  "b"  "c" 
[4,] "a"  "b"  "d"  "c"

Modelvalidatie - Interactieplots

with(dataset, interaction.plot(x.factor, trace.factor, response))
# example with the ToothGrowth dataset
with(ToothGrowth, interaction.plot(dose, supp, len))

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Laten we oefenen!

Experimenteel ontwerp in R