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Dissimilarity Index

Source: R/indices.R
dissimilarity_index.Rd

The Dissimilarity Index can be interpreted as the share of Group A visits that would need to be redistributed across media for the share of group A to be uniform across websites.

Usage

dissimilarity_index(grp_a, grp_b)

Arguments

grp_a

vector (usually corresponds to a column in a webtrack data frame) indicating the number of individuals of group A using a website

grp_b

vector (usually corresponds to a column in a webtrack data frame) indicating the number of individuals of group B using a website

References

Cutler, David M., Edward L. Glaeser, and Jacob L. Vigdor. "The rise and decline of the American ghetto." Journal of political economy 107.3 (1999): 455-506.

Examples

# perfect dissimilarity
grp_a <- c(5, 5, 0, 0)
grp_b <- c(0, 0, 5, 5)
dissimilarity_index(grp_a, grp_b)
#> [1] 1

# no dissimilarity
grp_a <- c(5, 5, 5, 5)
grp_b <- c(5, 5, 5, 5)
dissimilarity_index(grp_a, grp_b)
#> [1] 0