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  FielDHub



Overview

FielDHub is an R package/shiny design of experiments (DOE) app that aids in the creation of traditional, un-replicated, augmented and partially-replicated designs applied to agriculture, plant breeding, forestry, animal and biological sciences.

For more details and examples of all functions present in the FielDHub package. Please, go to https://didiermurillof.github.io/FielDHub/reference/index.html.

Usage

This is a basic example which shows you how to launch the app:

Diagonal Arrangement Example

A project needs to test 280 genotypes in a field containing 16 rows and 20 columns of plots. In this example, these 280 genotypes are divided among three different experiments. In addition, four checks are included in a systematic diagonal arrangement across experiments to fill 40 plots representing 12.5% of the total number of experimental plots. An option to include filler plots is also available for fields where the number of experimental plots does not equal the number of available field plots.

The figure above shows a map of an experiment randomized along with multiple experiments (three) and checks on diagonals. Distinctively colored check plots are replicated throughout the field in a systematic diagonal arrangement.

The figure above shows the layout for the three experiments in the field.

Using the FielDHub function diagonal_arrangement()

To illustrate using FielDHub to build experimental designs through R code, the design produced in the R Shiny interface described above can also be created using the function diagonal_arrangement() in the R script below. Note, that to obtain identical results, users must include the same seed number in the script as was used in the Shiny app. In this case, the seed number is 1249.

diagonal <- diagonal_arrangement(
  nrows = 16, 
  ncols = 20, 
  lines = 280, 
  checks = 4, 
  plotNumber = 101, 
  splitBy = "row", 
  seed = 1249, 
  kindExpt = "DBUDC", 
  blocks = c(100, 100, 80), 
  exptName = c("Expt1", "Expt2", "Expt3")
)

Users can print the returned values from diagonal_arrangement() as follow,

print(diagonal)
Un-replicated Diagonal Arrangement Design 

Information on the design parameters: 
List of 11
 $ rows          : num 16
 $ columns       : num 20
 $ treatments    : num [1:3] 100 100 80
 $ checks        : int 4
 $ entry_checks  : int [1:4] 1 2 3 4
 $ rep_checks    : num [1:4] 11 9 9 11
 $ locations     : num 1
 $ planter       : chr "serpentine"
 $ percent_checks: chr "12.5%"
 $ fillers       : num 0
 $ seed          : num 1249

 10 First observations of the data frame with the diagonal_arrangement field book: 
   ID  EXPT LOCATION YEAR PLOT ROW COLUMN CHECKS ENTRY TREATMENT
1   1 Expt1        1 2022  101   1      1      0    51    Gen-51
2   2 Expt1        1 2022  102   1      2      0    67    Gen-67
3   3 Expt1        1 2022  103   1      3      0    50    Gen-50
4   4 Expt1        1 2022  104   1      4      0    29    Gen-29
5   5 Expt1        1 2022  105   1      5      0    39    Gen-39
6   6 Expt1        1 2022  106   1      6      0    92    Gen-92
7   7 Expt1        1 2022  107   1      7      1     1   Check-1
8   8 Expt1        1 2022  108   1      8      0    58    Gen-58
9   9 Expt1        1 2022  109   1      9      0    23    Gen-23
10 10 Expt1        1 2022  110   1     10      0    54    Gen-54

First 12 rows of the fieldbook,

head(diagonal$fieldBook, 12)
   ID  EXPT LOCATION YEAR PLOT ROW COLUMN CHECKS ENTRY TREATMENT
1   1 Expt1        1 2022  101   1      1      0    51    Gen-51
2   2 Expt1        1 2022  102   1      2      0    67    Gen-67
3   3 Expt1        1 2022  103   1      3      0    50    Gen-50
4   4 Expt1        1 2022  104   1      4      0    29    Gen-29
5   5 Expt1        1 2022  105   1      5      0    39    Gen-39
6   6 Expt1        1 2022  106   1      6      0    92    Gen-92
7   7 Expt1        1 2022  107   1      7      1     1   Check-1
8   8 Expt1        1 2022  108   1      8      0    58    Gen-58
9   9 Expt1        1 2022  109   1      9      0    23    Gen-23
10 10 Expt1        1 2022  110   1     10      0    54    Gen-54
11 11 Expt1        1 2022  111   1     11      0    55    Gen-55
12 12 Expt1        1 2022  112   1     12      0     9     Gen-9

Users can plot the layout design from diagonal_arrangement() using the function plot() as follows,

plot(diagonal)

In the figure, gray, pink, and salmon shade the blocks of unreplicated experiments, while distinctively colored check plots are replicated throughout the field in a systematic diagonal arrangement.

The main difference between using the FielDHub Shiny app and using the standalone function diagonal_arrangement() is that the standalone function will allocate filler only if it is necessary, while in Shiny App, users can customize the number of fillers if it is needed. In cases where users include fillers, either between or after experiments, the Shiny app is preferable for filling and visualizing all field plots.

To see more examples, go to https://didiermurillof.github.io/FielDHub/articles/diagonal_arrangement.html

Partially Replicated Design Example

Partially replicated designs are commonly employed in early generation field trials. This type of design is characterized by replication of a portion of the entries, with the remaining entries only appearing once in the experiment. As an example, considered a field trial with 288 plots containing 75 entries appearing two times each, and 138 entries only appearing once. This field trials is arranged in a field of 16 rows by 18 columns.

In the figure above, green plots contain replicated entries, and the other plots contain entries that only appear once.

Using the FielDHub function partially_replicated()

Instead of using the Shiny FielDHub app, users can use the standalone FielDHub function partially_replicated(). The partially replicated layout described above can be produced through scripting as follows. As noted in the previous example, to obtain identical results between the script and the Shiny app, users need to use the same seed number, which, in this case, is 77.

pREP <- partially_replicated(
  nrows = 16, 
  ncols = 18,  
  repGens = c(138,75),
  repUnits = c(1,2),
  planter = "serpentine", 
  plotNumber = 1,
  exptName = "ExptA",
  locationNames = "FARGO",
  seed = 77
)

Users can print returned values from partially_replicated() as follows,

print(pREP)
Partially Replicated Design 

Information on the design parameters: 
List of 7
 $ rows                   : num 16
 $ columns                : num 18
 $ treatments_with_reps   : int 75
 $ treatments_with_no_reps: int 138
 $ locations              : num 1
 $ planter                : chr "serpentine"
 $ seed                   : num 77

 10 First observations of the data frame with the partially_replicated field book: 
   ID  EXPT LOCATION YEAR PLOT ROW COLUMN CHECKS ENTRY TREATMENT
1   1 ExptA    FARGO 2022    1   1      1      0    80       G80
2   2 ExptA    FARGO 2022    2   1      2     49    49       G49
3   3 ExptA    FARGO 2022    3   1      3     15    15       G15
4   4 ExptA    FARGO 2022    4   1      4     44    44       G44
5   5 ExptA    FARGO 2022    5   1      5      0   185      G185
6   6 ExptA    FARGO 2022    6   1      6      9     9        G9
7   7 ExptA    FARGO 2022    7   1      7      0   133      G133
8   8 ExptA    FARGO 2022    8   1      8     58    58       G58
9   9 ExptA    FARGO 2022    9   1      9      4     4        G4
10 10 ExptA    FARGO 2022   10   1     10      0   113      G113

First 12 rows of the fieldbook,

head(pREP$fieldBook, 12)
   ID  EXPT LOCATION YEAR PLOT ROW COLUMN CHECKS ENTRY TREATMENT
1   1 ExptA    FARGO 2022    1   1      1      0    80       G80
2   2 ExptA    FARGO 2022    2   1      2     49    49       G49
3   3 ExptA    FARGO 2022    3   1      3     15    15       G15
4   4 ExptA    FARGO 2022    4   1      4     44    44       G44
5   5 ExptA    FARGO 2022    5   1      5      0   185      G185
6   6 ExptA    FARGO 2022    6   1      6      9     9        G9
7   7 ExptA    FARGO 2022    7   1      7      0   133      G133
8   8 ExptA    FARGO 2022    8   1      8     58    58       G58
9   9 ExptA    FARGO 2022    9   1      9      4     4        G4
10 10 ExptA    FARGO 2022   10   1     10      0   113      G113
11 11 ExptA    FARGO 2022   11   1     11      0   190      G190
12 12 ExptA    FARGO 2022   12   1     12      0   148      G148

Users can plot the layout design from partially_replicated() using the function plot() as follows,

plot(pREP)

To see more examples, please go to https://didiermurillof.github.io/FielDHub/articles/partially_replicated.html