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# Factorio Runtime Docs Version 2.0.77

# ModuleEffectValue - Runtime Docs

## ModuleEffectValue :: float

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%.

Concept used in

- ModuleEffects