Time Serie - Correlation

Time Serie - Correlation


Two time series that are not related can have a strong, but spurious, correlation when a trend is added. This strong correlation is just the fact that they're both dependent on the time (X)

They both increase over time in the period you’re looking at. This is sometimes called secular trend.

See also: Statistics - Correlation does not imply causation

In exploring relationships between two time series, you really want to know whether variations in one series are correlated with variations in another. Therefore trend should be removed.

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Time Serie - (Trend|Sloping line) with regression

Trend is also known as sloping line. For Trend analysis (increase or decrease) , See secular trend. See
Time Serie - Analysis

Time series analysis aims to uncover specific patterns in these data to forecast future values basing on previously observed ones. In Time series, fixed variation are introduced into...

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