A graphical plot with abscissa given by the number 
of consecutive numbers constituting a single period and ordinate given by the correlation ratio 
. The equation of the periodogram is
of consecutive numbers constituting a single period and ordinate given by the correlation ratio . The equation of the periodogram is |
where each of the terms of the sequence 
consists of a simple periodic part of period 
, together with a part which does not involve this periodicity 
, so
consists of a simple periodic part of period , together with a part which does not involve this periodicity , so |
is the standard deviation of the 
s, 
is the standard deviation of the 
s, and 
is the number of periods covered by the observations.
Ref: mathworld.wolfram.com
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