Factorio Runtime DocsVersion 2.0.63

The percentual increase of the attribute. A value of 0.6 means a 60% increase.

Quality values are multiplied by LuaQualityPrototype::next_probability. For example, if a module's quality effect is 0.2 and the current quality's next_probability is 0.1, then the chance to get the next quality item is 2%.