Create Initial Values for Multidimensional Unfolding

Create Initial Values for Multidimensional Unfolding

Usage

make_init_mdu(
  Y,
  D,
  distance = c("squared", "euclidean"),
  alpha = c("random", "fix"),
  distance_eps = 1e-04,
  min_sigma = 0.1
)

Arguments

Y

Numeric matrix or data frame (N rows x M items).

D

Number of unfolding dimensions.

distance

Character; `"squared"` or `"euclidean"`.

alpha

Character; `"random"` for item-specific alpha initial values or `"fix"` for a common alpha initial value.

distance_eps

Small positive constant added to the distance.

min_sigma

Minimum initial residual standard deviation.

Value

A named list of initial values.