Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Very nice statement from wiki:

When three or more unrelated parameters are measured, their total MSE can be reduced by using a combined estimator such as the James–Stein estimator; whereas when each parameter is estimated separately, the least squares (LS) estimator is admissible.

So I wonder if it offers any new interpretation for distinction between micro(lot of quantum phenomenons) and macro(where everything seems to be defined "more precisely" when "looking at the object as a whole") world.

share|cite|improve this question
Googling for "quantum james-stein estimator",, gives an indication that at least some statisticians and physicists have spent time thinking about the applicability of James-Stein estimation to situations in which there are incompatible measurements. My presentiment is that measurement incompatibility is installed into QT at such a low level that it's unlikely that a relatively high level result such as James-Stein will make a fundamental difference. – Peter Morgan May 24 '12 at 11:54

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.