guttman: Guttman's 6 Lambda Coefficients

In Lambda4: Collection of Internal Consistency Reliability Coefficients.

Description

Calculates all 6 of Guttman's lambda coefficients.

Usage

  guttman(x, missing = "complete", standardize = FALSE)

Arguments

x	Can be either a data matrix or a covariance matrix
missing	How to handle missing values.
standardize	When TRUE Results are standardized by using the correlation matrix instead of the covariance matrix for computation.

Value

Lambda1	Guttman's Lambda1 estimate of reliability.
Lambda2	Guttman's Lambda2 estimate of reliability.
Lambda3	Guttman's Lambda3 estimate of reliability. Also known as Cronbach's alpha or coefficient alpha.
Lambda4	Guttman's maximimal Lambda4 estimate of reliability.
Lambda5	Guttman's Lambda5 estimate of reliability.
Lambda6	Guttman's Lambda6 estimate of reliability.

Note

The estimate for Lambda4 is maximized.

Author(s)

Tyler Hunt [e-mail]

References

Guttman L (1945). "A Basis for Analyzing Test-Retest Reliability." Psychometrika, 10, 255-282.

Examples

guttman(Rosenberg)

Example output

Guttman's Lambda Coefficients

Lambda1      0.792
Lambda2      0.887
Lambda3      0.88
Lambda4(max)	0.91
Lambda5      0.869
Lambda6      0.896

Lambda4 documentation built on May 2, 2019, 1:05 p.m.