So I have a metric, say, accuracy, which is originally 70% and then raised to 80%. I want to say the accuracy increases by 10%. But it is ambiguous, as some may interpret it as the current accuracy is 70%·110%. How can I say it so that people will undoubtedly understand the increased result as 70% + 10%?
This is a very relevant question to ask.So often it is unclear what people mean.
For my own part I only say "it has increased by 10%", if I mean exactly that i.e, in your example, from 70% to 77%.
Otherwise I would say "it has risen by ten percentage points" - meaning from 70% to 80%.
The original accuracy was increased/has increased/increased from 70% to 80%.