Dear all,
I measure a physical quantity about 100 times. I am not interessted in the
mean value but the spread (the RMS) of this quantity. I can calculate the RMS
easily, but I also need the error on the RMS. Could you give me a hint how to
calculate the error on the rms?
May be I should add, that the spread is not due to the measurement, but real.
A good example would be a metal bar, which expands and shrinks due to
stochastic temperature effects. The value I would be interessted in, is the
_length_variation_ and an _error_estimation_ for this value.
The distribution of the quantity I am looking at could be approximated by an
gaussian (just in case it eases the discussion). At least it looks like a
gaussian, when I histogram it.
Thanks a _lot_ in advance!
Selim
--
Selim Issever | Tel: 040 8998-2843 +- C++ -- The language in which -
DESY-F15 | Fax: 040 8998-4033 +- only friends can access your -
Notkestr. 85 | [EMAIL PROTECTED] +- private members. -- Anon. ----
22603 Hamburg/Germany | http://www.physik.uni-dortmund.de/~issevers
<< S M M + +: Your new mapping mud client @ http://smm.mudcenter.com >>
===========================================================================
This list is open to everyone. Occasionally, less thoughtful
people send inappropriate messages. Please DO NOT COMPLAIN TO
THE POSTMASTER about these messages because the postmaster has no
way of controlling them, and excessive complaints will result in
termination of the list.
For information about this list, including information about the
problem of inappropriate messages and information about how to
unsubscribe, please see the web page at
http://jse.stat.ncsu.edu/
===========================================================================
