3. Trends and seasonal factors
We are interested here in non-stationary series, generally composed of :
long-term" trends;
periodic or nearly periodic components ;
of a random game.
The techniques developed aim to identify trends and periodic components.
Among the tools used, the empirical covariance and the periodogram deserve special mention.
Indeed, they are described in paragraph 4
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Trends and seasonal factors
Covariance and spectral density
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