rough measure

For example, certain companies purchase fake Facebook fans— or even Facebook “likes,” which are a rough measure of popularity.

The meter at a gas station can be seen as a rough measure of dollars being sucked out of the U.S. consumer and sent abroad.

The experiment gives us a rough measure of the relative conductivities and the relative degrees of ionization of the three bases.

In fact we find "a bow shot" used as a rough measure of distance, equivalent to about 400 yards.

Does not this afford a rough measure of the collective wisdom of such States as at present exist in this world?

This then is a rough measure of how little is known about cockroaches.

He admitted the broad distinctions which have become proverbial, and are therefore only a rough measure of the truth.