similarity {SemNeT}

Measures of Similarity

Description

Computes several measures of similarity (see Choi, Cha, & Tappert, 2010 for additional measures)

Usage

similarity(
  data,
  method = c("angular", "cor", "cosine", "euclid", "faith", "jaccard", "phi", "rr")
)

Arguments

data

Matrix or data frame. A binarized dataset of verbal fluency or linguistic data

method

Character. Type of similarity measure to compute.

Below are the definitions for each bin:

	1	0
1	a	b	a+b	(R1)
0	c	d	c+d	(R2)
	a+c	b+d	a+b+c+d	(N)
	(C1)	(C2)	(N)

Options include:

• "angular" = 1 - (2 * acos(cosine similarity) / \pi)

• "cosine" = a / \sqrt{(a + b)(a + c)}

• "faith" = a + 0.5d / a + b + c + d

• "jaccard" = a / a + b + c

• "phi" and "cor" = ad - bc / \sqrt(R1 x R2 x C1 x C2)

• "rr" = a / a + b + c + d

Value

A symmetric similarity matrix

Author(s)

Alexander Christensen <[e-mail]>

References

Choi, S. S., Cha, S. H., & Tappert, C. C. (2010). A survey of binary similarity and distance measures. Journal of Systemics, Cybernetics and Informatics, 8, 43-48.

Examples

# Simulate Datasets
one <- sim.fluency(10)

# Compute similarity matrix
cos <- similarity(one, method = "cosine")