nomclust (version 2.8.0)

goodall1: Goodall 1 (G1) Measure

Description

The function calculates a dissimilarity matrix based on the G1 similarity measure.

Usage

goodall1(data, var.weights = NULL)

Value

The function returns an object of the class "dist".

Arguments

data

A data.frame or a matrix with cases in rows and variables in column.

var.weights

A numeric vector setting weights to the used variables. One can choose the real numbers from zero to one.

Author

Zdenek Sulc.
Contact:

Details

The Goodall 1 similarity measure was presented in (Boriah et al., 2008). It is a simple modification of the original Goodall measure (Goodall, 1966). The measure assigns higher weights to infrequent matches.

References

Boriah S., Chandola V., Kumar V. (2008). Similarity measures for categorical data: A comparative evaluation. In: Proceedings of the 8th SIAM International Conference on Data Mining, SIAM, p. 243-254.

Goodall V.D. (1966). A new similarity index based on probability. Biometrics, 22(4), p. 882.

See Also

anderberg, burnaby, eskin, gambaryan, goodall2, goodall3, goodall4, iof, lin, lin1, of, sm, smirnov, ve, vm.

Examples

# sample data
data(data20)

# dissimilarity matrix calculation
prox.goodall1 <- goodall1(data20)

# dissimilarity matrix calculation with variable weights
weights.goodall1 <- goodall1(data20, var.weights = c(0.7, 1, 0.9, 0.5, 0))