mlr3measures (version 1.0.0)

pbias: Percent Bias

Description

Measure to compare true observed response with predicted response in regression tasks.

Usage

pbias(truth, response, sample_weights = NULL, na_value = NaN, ...)

Value

Performance value as numeric(1).

Arguments

truth

(numeric())
True (observed) values. Must have the same length as response.

response

(numeric())
Predicted response values. Must have the same length as truth.

sample_weights

(numeric())
Vector of non-negative and finite sample weights. Must have the same length as truth. The vector gets automatically normalized to sum to one. Defaults to equal sample weights.

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.

Meta Information

• Type: "regr"

• Range: \((-\infty, \infty)\)

• Minimize: NA

• Required prediction: response

Details

The Percent Bias is defined as $$ \frac{1}{n} \sum_{i=1}^n w_i \frac{\left( t_i - r_i \right)}{\left| t_i \right|}, $$ where \(w_i\) are normalized sample weights. Good predictions score close to 0.

See Also

Other Regression Measures: ae(), ape(), bias(), ktau(), linex(), mae(), mape(), maxae(), maxse(), medae(), medse(), mse(), msle(), pinball(), rae(), rmse(), rmsle(), rrse(), rse(), rsq(), sae(), se(), sle(), smape(), srho(), sse()

Examples

set.seed(1)
truth = 1:10
response = truth + rnorm(10)
pbias(truth, response)