Optimal designs

[kaibagley]

Hey, coming from a package called DiGGer (not on CRAN) which uses A-optimality for optimal designs. Wondering if this package uses anything similar, or has plans to implement optimal designs at some point.

Thanks!

[DidierMurilloF]

FielDHub designs based on incomplete blocks are optimized for A-Efficiency factor (A-optimality). Designs and their equivalent functions in FieldHub that use A-efficiency are:

• Incomplete blocks; incomplete_blocks()
• Square lattice; square_lattice()
• Rectangular lattice; rectangular_lattice()
• Alpha lattice; alpha_lattice()
• Row column; row_column()

For example, see the following row-column design example:

rcd <- row_column(
  t = 45,
  nrows = 5,
  r = 3,
  l = 1, 
  plotNumber = 101, 
  locationNames = "FARGO",
  seed = 1244
)

print(rcd)

Resolvable Row-Column Design (Two-Step Optimization) 

Efficiency of design: 
   Level Blocks D-Efficiency A-Efficiency   A-Bound
1    Rep      3    1.0000000    1.0000000 1.0000000
2    Row     15    0.8940648    0.8767593 0.8842892
3 Column     27    0.7912269    0.7624155 0.7674419

Both ROWS and COLUMN factors are optimized using an A-Efficiency factor.

[kaibagley]

Thanks for the reply! How come only the incomplete block-based designs?

[DidierMurilloF]

Those are the most common optimal designs, considering the scope of the FielDHub project.

[kaibagley]

That's fair, thanks!

[kaibagley]

Hello again, I'm wondering if you'd be willing to accept a PR regarding optimal designs for some of the other designs?

[DidierMurilloF]

Yes—please open one PR per design you’d like to add.