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ppv

Positive Predictive Value

Description

Binary classification measure defined as

TP / (TP + FP).

Also know as "precision".

Usage

ppv(truth, response, positive, na_value = NaN, ...)

precision(truth, response, positive, na_value = NaN, ...)

Arguments

truth

(factor())
True (observed) labels. Must have the exactly same two levels and the same length as response.
response

(factor())
Predicted response labels. Must have the exactly same two levels and the same length as truth.
positive

(character(1))
Name of the positive class.
na_value

(numeric(1))
Value that should be returned if the measure is not defined for the input (as described in the note). Default is NaN.
...

(any)
Additional arguments. Currently ignored.

Value

Performance value as numeric(1).

Meta Information

  • Type: "binary"

  • Range: [0, 1]

  • Minimize: FALSE

  • Required prediction: response

Note

This measure is undefined if TP + FP = 0.

References

See Also

Other Binary Classification Measures: auc(), bbrier(), dor(), fbeta(), fdr(), fnr(), fn(), fomr(), fpr(), fp(), mcc(), npv(), prauc(), tnr(), tn(), tpr(), tp()

Examples

set.seed(1)
lvls = c("a", "b")
truth = factor(sample(lvls, 10, replace = TRUE), levels = lvls)
response = factor(sample(lvls, 10, replace = TRUE), levels = lvls)
ppv(truth, response, positive = "a")
mlr3measures

Performance Measures for 'mlr3'

v0.3.1
LGPL-3
Authors
Michel Lang [cre, aut] (<https://orcid.org/0000-0001-9754-0393>), Martin Binder [ctb]
Initial release

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