In Stats What Does or Mean?

Or means that the outcome has to satisfy one condition, or the other condition, or both at the same time.

What does the U represent in statistics?

From Wikipedia, the free encyclopedia. In statistical theory, a U-statistic is a class of statistics that is especially important in estimation theory; the letter "U" stands for unbiased. In elementary statistics, U-statistics arise naturally in producing minimum-variance unbiased estimators.

Does or mean multiply or add?

When you do an Or operation you do a join of all your result sets which can be seen as an addition. The Or and And should be seen as operations on your (sub)result set(s) and not as multiplications or additions.