"You have to somehow compare people and what they did," Mr. Stern said.

So you can compare people working in the same store, to measure whether men and women are paid differently.

"I don't think it's fair to compare people with people," he said.

I try not to compare people or make nice, neat assumptions.

Leavitt said, "It's a way I created to compare people and what they do across all kinds of different areas."

They received media attention in 2007 from an advertising campaign that compared people with learning disabilities to pets.

Probably comparing people involved in the production of cigarettes to Satan.

Franson's comments were understood to be comparing people who receive food stamps to wild animals.

He got it last year when he saw the data from the study comparing lean people and obese ones.

Many women would like to see studies that compare people who stay on the pill to those who don't.