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fpc (version 2.1-6)

confusion: Misclassification probabilities in mixtures

Description

Estimates a misclassification probability in a mixture distribution between two mixture components from estimated posterior probabilities regardless of component parameters, see Hennig (2010).

Usage

confusion(z,pro,i,j,adjustprobs=FALSE)

Arguments

z
matrix of posterior probabilities for observations (rows) to belong to mixture components (columns), so entries need to sum up to 1 for each row.
pro
vector of component proportions, need to sum up to 1.
i
integer. Component number.
j
integer. Component number.
adjustprobs
logical. If TRUE, probabilities are initially standardised so that those for components i and j add up to one (i.e., if they were the only components).

Value

  • Estimated probability that an observation generated by component j is classified to component i by maximum a posteriori rule.

References

Hennig, C. (2010) Methods for merging Gaussian mixture components, Advances in Data Analysis and Classification, 4, 3-34.

Examples

Run this code
set.seed(12345)
  m <- rpois(20,lambda=5)
  dim(m) <- c(5,4)
  pro <- apply(m,2,sum)
  pro <- pro/sum(pro)
  m <- m/apply(m,1,sum)
  confusion(m,pro,1,2)

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