There are measurements that do.
I'm under the impression that some people (not you, of course) falsely assume, the terms "load" and "load dependancy" had anything to do with "power" or with "loudness". They don't. Not as far as frequency response is concerned.
Should an amplifier be unable to drive reactivate loads properly, then yes, it will start clipping at lower voltages than it will into purely resistive load. But that's really not the issue everybody's talking about when it come to "load dependancy". I'd go so far and say it's not an issue at all with conventional dynamic speakers, unless the unit is faulty.