R: Measures of Accuracy

omission {SDMTools} | R Documentation

## Measures of Accuracy

### Description

Estimates different measures of accurracy given a confusion matrix.

### Usage

    omission(mat)

    sensitivity(mat)

    specificity(mat)

    prop.correct(mat)

### Arguments

`mat` | a confusion matrix of class 'confusion.matrix' from `confusion.matrix`

### Value

returns single values representing the:

`ommission` | the ommission rate as a proportion of true occurrences misidentified given the defined threshold value
`sensitivity` | the sensitivity given the defined threshold value
`specificity` | the specificity given the defined threshold value
`prop.correct` | the proportion of the presence and absence records correctly identified given the defined threshold value

### Author(s)

Jeremy VanDerWal jjvanderwal@gmail.com

### See Also

`auc`, `Kappa`, `confusion.matrix`, `accuracy`

### Examples

    #create some data
    obs = c(sample(c(0,1),20,replace=TRUE),NA); obs = obs[order(obs)]
    pred = runif(length(obs),0,1); pred = pred[order(pred)]

    #calculate the confusion matrix
    mat = confusion.matrix(obs,pred,threshold=0.5)

    #calculate the accuracy measures
    omission(mat)
    sensitivity(mat)
    specificity(mat)
    prop.correct(mat)

[Package SDMTools version 1.1-221.2 Index]