Fundamentals of Statistics contains material of various lectures and courses of H. Lohninger on statistics, data analysis and chemometrics......click here for more. 
See also: forecasting  
Time Series  Trends
When measuring the temperature twice a day, the resulting time series may be as follows:
After averaging out the daily cycles, which are caused by measuring twice a day, the following time series is obtained: Finally, removing both the trend and the cycles results in the following series: Now, it is time to check the properties of the resulting time series.
If it is actually stationary, it provides the basis for setting up a model.
In order to forecast future values, the result obtained by using the model
has to be transformed so that the trend and the daily cycle are again taken
into account.


Last Update: 20121008