redesign {DeclareDesign} | R Documentation |
redesign
quickly generates a design from an existing one by resetting symbols used in design handler parameters in a step's environment (Advanced).
redesign(design, ..., expand = TRUE)
design |
An object of class design. |
... |
Arguments to redesign e.g., |
expand |
If TRUE, redesign using the crossproduct of |
Warning: redesign
will edit any symbol in your design, but if the symbol you attempt to change does not exist in a step's environment no changes will be made and no error or warning will be issued.
Please note that redesign
functionality is experimental and may be changed in future versions.
A design, or, in the case of multiple values being passed onto ...
, a 'by'-list of designs.
n <- 500
population <- declare_model(N = 1000)
sampling <- declare_sampling(S = complete_rs(N, n = n),
legacy = FALSE)
design <- population + sampling
# returns a single, modified design
modified_design <- redesign(design, n = 200)
# returns a list of six modified designs
design_vary_N <- redesign(design, n = seq(400, 900, 100))
# When redesigning with arguments that are vectors,
# use list() in redesign, with each list item
# representing a design you wish to create
prob_each <- c(.1, .5, .4)
assignment <- declare_assignment(
Z = complete_ra(prob_each = prob_each),
legacy = FALSE)
design <- population + assignment
# returns two designs
designs_vary_prob_each <- redesign(
design,
prob_each = list(c(.2, .5, .3), c(0, .5, .5)))
# To illustrate what does and does not get edited by redesign,
# consider the following three designs. In the first two, argument
# X is called from the step's environment; in the third it is not.
# Using redesign will alter the role of X in the first two designs
# but not the third one.
X <- 3
f <- function(b, X) b*X
g <- function(b) b*X
design1 <- declare_model(N = 1, A = X) + NULL
design2 <- declare_model(N = 1, A = f(2, X)) + NULL
design3 <- declare_model(N = 1, A = g(2)) + NULL
draw_data(design1)
draw_data(design2)
draw_data(design3)
draw_data(redesign(design1, X=0))
draw_data(redesign(design2, X=0))
draw_data(redesign(design3, X=0))