Learn English – How to describe data changes over time

time

I have a dataset, it has the problem that data changes overtime.

enter image description here

In the pic above, the distribution is plotted every 5 years, and it could be seen that the distribution is not constant, it changes over time?

How should I describe it? I used to call it time shift, but it seems not very proper? I need a short title to put it in a sub-title in my paper.

Best Answer

You can say it is labile or has lability (readily changing or widely fluctuating). Example sentence: Lability in the data makes it difficult to pin point stuff.