These functions provide convenient wrappers to create the three types of metric functions in yardstick: numeric metrics, class metrics, and class probability metrics. They add a metric-specific class to fn and attach a direction attribute. These features are used by metric_set() and by tune when model tuning.

See vignette("custom-metrics") for more information about creating custom metrics.

new_class_metric(fn, direction)

new_prob_metric(fn, direction)

new_numeric_metric(fn, direction)



A function. The metric function to attach a metric-specific class and direction attribute to.


A string. One of:

  • "maximize"

  • "minimize"

  • "zero"