Draw plausible parameter instantiations from a given model
Draws plausible parameters from a model using parametric sampling (if the information matrix
was computed) or via boostrap sampling. Primarily for use with the DRF function.
draw_parameters(
mod,
draws,
method = c("parametric", "boostrap"),
redraws = 20,
...
)mod |
estimated single or multiple-group model |
draws |
number of draws to obtain |
method |
type of plausible values to obtain. Can be 'parametric', for the parametric sampling
scheme which uses the estimated information matrix, or 'boostrap' to obtain values from the |
redraws |
number of redraws to perform when the given parameteric sample does not satisfy the upper and lower parameter bounds. If a valid set cannot be found within this number of draws then an error will be thrown |
... |
additional arguments to be passed |
returns a draws x p matrix of plausible parameters, where each row correspeonds to a single set
## Not run:
set.seed(1234)
n <- 40
N <- 500
# only first 5 items as anchors
model <- 'F = 1-40
CONSTRAINB = (1-5, a1), (1-5, d)'
a <- matrix(1, n)
d <- matrix(rnorm(n), n)
group <- c(rep('Group_1', N), rep('Group_2', N))
## -------------
# groups completely equal
dat1 <- simdata(a, d, N, itemtype = 'dich')
dat2 <- simdata(a, d, N, itemtype = 'dich')
dat <- rbind(dat1, dat2)
mod <- multipleGroup(dat, model, group=group, SE=TRUE,
invariance=c('free_means', 'free_var'))
param_set <- draw_parameters(mod, 100)
head(param_set)
## End(Not run)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.