The simplest is simply to scale
a known noise source, time - shift it by N months (or M years for annual data), and minimize the resulting residuals.
Not exact matches
The point at which a trend becomes clear within the average temperature data for a given region —
known as the «time of emergence» — depends on when the
source of the warming begins, how fast it happens and the amount of background «
noise» obscuring the signal.
After a recent delay,
sources are revealing that the Star Wars themed Xbox 360 (you
know, the one that makes those cool R2 - D2
noises) may be releasing in April 2012.
90 Brian Dodge says, «Often what is loosely called «
noise» is not only not normally distributed (thank you tamino), but is in fact an interfering signal from a
known source.»
Often what is loosely called «
noise» is not only not normally distributed (thank you tamino), but is in fact an interfering signal from a
known source.
In order to understand the potential importance of the effect, let's look at what it could do to our understanding of climate: 1) It will have zero effect on the global climate models, because a) the constraints on these models are derived from other
sources b) the effect is
known and there are methods for dealing the errors they introduce c) the effect they introduce is local, not global, so they can not be responsible for the signal / trend we see, but would at most introduce
noise into that signal 2) It will not alter the conclusion that the climate is changing or even the degree to which it is changing because of c) above and because that conclusion is supported by multiple additional lines of evidence, all of which are consistent with the trends shown in the land stations.
Skeptical Science has posted a relevant piece, and video, tonight that strips away
sources of
known «
noise» and shows a steady underlying warming trend: «16 (more) years of global warming.»
relationship between
noise sources, the method used to generate the wave produces exactly the same wave over and over and over again on multiple other
known not valid values when run in simulation.
If (1) and (2) are true, then how do we
know ocean circulation is not a
source of, say, 1 / f
noise?
Instead of the classical filter, the actual temperature record should be compensated by
known sources of
noise: http://contextearth.com/2013/10/04/climate-variability-and-inferring-global-warming/
Since the
source of hum in many early electronic amplifiers was well
known and quantified - power supply ripple - it was often removed as «
noise» by introducing a scaled amount of the ripple into the amplifier chain so as to cancel its effect at the output.