Uschi's classification performance measures

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Description

Function to calculate the Correctness Rate, the Accuracy, the Ability to Seperate and the Confidence of a classification rule.

Usage

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ucpm(m, tc, ec = NULL)

Arguments

m

matrix of (scaled) membership values

tc

vector of true classes

ec

vector of estimated classes (only required if scaled membership values are used)

Details

  • The correctness rate is the estimator for the correctness of a classification rule (1-error rate).

  • The accuracy is based on the euclidean distances between (scaled) membership vectors and the vectors representing the true class corner. These distances are standardized so that a measure of 1 is achieved if all vectors lie in the correct corners and 0 if they all lie in the center.

  • Analougously, the ability to seperate is based on the distances between (scaled) membership vectors and the vector representing the corresponding assigned class corner.

  • The confidence is the mean of the membership values of the assigned classes.

Value

A list with elements:

CR

Correctness Rate

AC

Accuracy

AS

Ability to Seperate

CF

Confidence

CFvec

Confidence for each (true) class

Author(s)

Karsten Luebke, karsten.luebke@fom.de

References

Garczarek, Ursula Maria (2002): Classification rules in standardized partition spaces. Dissertation, University of Dortmund. URL http://hdl.handle.net/2003/2789

Examples

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library(MASS)
data(iris)
ucpm(predict(lda(Species ~ ., data = iris))$posterior, iris$Species)

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