The package **optedr** is an optimal experimental design suite for calculating optimal designs, D-augmenting designs and efficiently rounding approximate design. Among its capabilities are:

- Calculating D-, Ds-, A- and I-optimal designs for non-linear models.
- D-augment designs controlling the loss of efficiency.
- Evaluate the efficiency of a given design against the optimum.
- Efficiently rounding approximate designs to exact designs.

You can install the released version of optedr from CRAN with:

You can install the latest version of the package from GitHub with:

The user available functions are:

`opt_des()`

calculates optimal designs.`design_efficiency()`

evaluates the efficiency of a design against the optimum.`augment_design()`

augments designs, allowing the user to add points controlling the D-efficiency.`efficient_round()`

efficiently round approximate designs.`shiny_optimal()`

demo of optimal designs calculation with a graphical interface, applied to*Antoineâ€™s Equation*.`shiny_augment()`

demo of augmenting design with a graphical interface, usable for a handful of models.

The `optdes`

object generated by `opt_des()`

has its own implementation of `print()`

, `summary()`

and `plot()`

.

The calculation of an optimal design requires a to specify the `Criterion`

, the `model`

, the `parameters`

and their initial values and the `design_space`

.

```
resArr.D <- opt_des(Criterion = "D-Optimality",
model = y ~ a*exp(-b/x),
parameters = c("a", "b"),
par_values = c(1, 1500),
design_space = c(212, 422))
#> i Stop condition not reached, max iterations performed
#> i The lower bound for efficiency is 99.9986396401789%
resArr.D$optdes
#> Point Weight
#> 1 329.2966 0.5000068
#> 2 422.0000 0.4999932
resArr.D$sens
```

After calculating the D-optimal design, the user might want to add points to the design to fit their needs:

```
aug_arr <- augment_design(resArr.D$optdes, 0.3, y ~ a * exp(-b/x),
parameters = c("a", "b"),
par_values = c(1, 1500),
design_space = c(212, 422),
F)
```

```
#> The region(s) are [250.98-422]The region(s) are [250.98-422]The region(s) are [250.98-422]
aug_arr
#> Point Weight
#> 1 329.2966 0.3500048
#> 2 422.0000 0.3499952
#> 3 260.0000 0.1500000
#> 4 380.0000 0.1500000
```

This new design can be rounded to the desired number of points:

```
(exact_design <- efficient_round(aug_arr, 20))
#> Point Weight
#> 1 329.2966 7
#> 2 422.0000 7
#> 3 260.0000 3
#> 4 380.0000 3
```

And its efficiency compared against the optimum: