vanhees71 said:
When I talk to experimentalists they all understand under "ensembles" their millions of repetitions of scattering experiments taken with real-world detectors (measurement) using particles from an accelerator (preparation).
PeterDonis said:
Then perhaps there is a difference of terminology between different parts of the physics community in this regard. Is there a standard reference that experimentalists use for such terminology?
I know that you are asking vanhees71 for a "reference of experimentalists terminology". I cannot help with that. But maybe I can help with terminology common among (applied) statisticians:
haushofer said:
I'm reading The art of statistics by Spiegelhalter now. Fun book which stresses conceptual aspects of statistics and data analysis.
That is indeed a very good and readable book, and it contains a 24-page glossary and a 7-page index. Here are some examples from the glossary:
aleatory uncertainty: unavoidable unpredictability about the future, also known as chance, randomness, luck and so on.
epistemic uncertainty: lack of knowledge about facts, numbers or scientific hypotheses.
probability: the formal mathematical expression of uncertainty. Let P(A) be ...
probability distribution: a generic term for a mathematical expression of the chance of a random variable taking on particular values. A random variable X has ...
sampling distribution: the probability distribution of a statistic.
statistic: a meaningful number derived from a set of data.
Neither the glossary nor the index contain the word "ensemble," and the word "empirical" only appears in the index as:
empirical distribution 197, 404
sampling distribution 197, 404
My feeling would have been that the actual finite experimental ensemble would be called "empirical ensemble," but maybe this usage of "empirical" was only common 25 years ago in Germany, when I had statistics and probability courses at university. But "sampling ensemble" would not sound nice in my ears. But even back then, we were told that of course the clarifying word "empirical" would often be omitted, but that we should still try to distinguish between the formal mathematical expression and the actual empirical data.