A regression analysis can demonstrate correlation, but it doesn't prove cause.

These so-called epidemiological studies can never prove cause and effect.

"It is difficult to prove cause and effect on the ground where multiple factors interact in complex ways," she said.

But the new data analysis, the company said, does not prove cause and effects.

The study did not prove cause and effect, they said.

But all this observation can do is find associations: it can't prove cause and effect.

Observational studies such as this one don't prove cause and effect.

Studies such as these can only indicate a statistical association, not prove cause and effect.

A spokeswoman for the meat industry, however, said the study did not prove cause and effect.

Without your consent, the pigs must prove probable cause in the court.