Dimensionality — Dimensionality • exametrika

The dimensionality is the number of components the test is measuring.

Usage

Dimensionality(U, na = NULL, Z = NULL, w = NULL)

# Default S3 method
Dimensionality(U, na = NULL, Z = NULL, w = NULL)

# S3 method for class 'binary'
Dimensionality(U, na = NULL, Z = NULL, w = NULL)

# S3 method for class 'rated'
Dimensionality(U, na = NULL, Z = NULL, w = NULL)

# S3 method for class 'ordinal'
Dimensionality(U, na = NULL, Z = NULL, w = NULL)

Arguments

U: Either an object of class "exametrika" or raw data. When raw data is given, it is converted to the exametrika class with the dataFormat function.
na: Values to be treated as missing values.
Z: Missing indicator matrix of type matrix or data.frame. Values of 1 indicate observed responses, while 0 indicates missing data.
w: Item weight vector specifying the relative importance of each item.

Value

Returns a list of class c("exametrika", "Dimensionality") containing:

Component: Sequence of component numbers
Eigenvalue: Eigenvalues of the tetrachoric correlation matrix
PerOfVar: Percentage of variance explained by each component
CumOfPer: Cumulative percentage of variance explained