Can hypothesis for doctoral dissertation be formulated as "to demonstrate that approach X can be used effeciently/successfully to model Y"?
I'm trying to use novel approach X that has been rarely used in my field to model Y in my country where X has not been used at all.
The problem is I don't have anything to compare it with Y to validate my results. I can only compare Y with Z which has been modeled using different approach and aggregates several other factors that are not the subject of my research. They are not directly comparable but both Y and Z should have similar trend. Nevertheless, I will compare these two to check external validity of my results.
In addition, there are some previous predictions about Y which I will also use for testing/proving validity of my results.