EX POST FACTO - A term used to designate action taken to change the effect given to a set of circumstances. This action relates back to a prior time, and imposes this new effect upon the same set of circumstances that existed at the time of the occurrence.
When referring to law or legislation, establishing ex post facto laws is prohibited by the U.S. Constitution.
In scientific terms it could refer to research conducted into a particular phenomenon conducted AFTER it has taken place.
Ex post facto research is the process beginning with a phenomenon and going backward in time to identify casual factors.
"The term ""Ex Post Facto, in simple English, means ""After the Fact"", or in other words, retroactive. In criminal law, it can mean that laws cannot be applied retroactively."
after the fact answers about what happened to the measured variable
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