Stat Multipliers in Scenario builder

[Lalunamuerta]

Hello rimworld friends, I am currently dabbling in the stat multiplier option in the scenario editor. I have a question, Does the stat multiplier add the ammount on top of whats already there?
For example, Setting a diplomacy skill multiplier to 100% would basically equate to +100%, basically double.

Or does it set the stat multiplier to 100%, so 90% would be weaker than vanilla, 110% stronger and along that line of thought?

[AlexMBrennan]

The word "multiplier" would seem to imply multiplication and not addition.

[Astasia]

A 50% multiplier means reduced in half, 100% is no change, 200% is double.