Editor: Metrics

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See also the [[/metric/all/|list of metrics]].

== Introduction

A **metric** is a number measuring a particular facet of animal food production.  By having many metrics, we can divide up concerns in a granular way.  Any user can then combine these metrics to form new metrics according to their own preferences or values.

There are currently two kinds of metrics: **basic metrics** and **derived metrics**.

==  Overview

===  Basic metrics

A basic metric simply assigns a single numerical value to each type of animal food.  The meaning of the number is up to the person who creates the metric, and should be explained in its description.

===  Derived metrics

A derived metric is a formula that combines other metrics into a single number.  The other metrics can be basic metrics or derived metrics, that is, any total metric.  Metrics can be added, multiplied, weighed and averaged, exponentiated, and so on.

A derived metric depends on other metrics, so if they are changed, say in response to new or updated information, the derived metric will change as well.

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