Alpha Coefficient if Item removed

This function returns the alpha coefficient when the specified item is excluded.

Usage

AlphaIfDel(x, delItem = NULL, na = NULL, Z = NULL, w = NULL)

Arguments

x

This should be a data matrix or a Covariance/Phi/Tetrachoric matrix.

delItem

Specify the item to be deleted. If NULL, calculations are performed for all cases.

na

This parameter identifies the numbers or characters that should be treated as missing values when 'x' is a data matrix.

Z

This parameter represents a missing indicator matrix. It is only needed if 'x' is a data matrix.

w

This parameter is an item weight vector. It is only required if 'x' is a data matrix.