optpart: lambda – R documentation

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lambda

Goodman- Kruskal Lambda Index of Classification Association

Compares two classifications by calculating the Goodman-Kruskal Index of association

lambda(x,y,digits=5)

`x`	an object of class ‘clustering’, ‘partana’, ‘partition’ or a vector identifying membership of objects in classes with names attribute
`y`	an object of class ‘clustering’, ‘partana’, ‘partition’ or a vector identifying membership of objects in classes with names attribute
`digits`	the number of digits of the statsitic to report

lambda calculates the Goodman-Kruskal index of association:

∑_i max_j (n_{ij}) + ∑_j max_i (n_{ij}) - max(n_{i,}) - max(n{_.j}) \over 2*∑_i∑_j n_{ij} - max(n_{i,}) - max(n{_.j)}

Prints a cross-tabulated table and the lambda statistic, and (invisibly) returns the lambda statistic

data(shoshveg)
dis.bc <- dsvdis(shoshveg,'bray/curtis')
opt.5 <- optpart(5,dis.bc)
pam.5 <- pam(dis.bc,5)
lambda(opt.5,pam.5)

Optimal Partitioning of Similarity Relations

v3.0-3

GPL (>= 2)

Authors

David W. Roberts <droberts@montana.edu>

Initial release