positive correlation
direct correlation

Let's start with the positive correlation: books in the home equal higher test scores.

There might even be some positive correlations between these two sets of variables.

This provides a strong base for a positive correlation between perceived ability and career choice.

He found a single common factor explained the positive correlations among tests.

Forty years of research has shown positive correlation between play and children's learning.

Studies have shown a positive correlation between school meal programs and increased food security.

But naturally there is a strong positive correlation between them.

These two variables have a positive correlation with each other.

Then there is the positive correlation between more education and fewer children.

A number of studies found a positive correlation between video game play and increased violent behavior.