mining.trenddistance.AverageValueAbsolute Class Reference

Trend distance based on the average of values in a stream. More...

Static Public Member Functions
static void	main (String[] args)

Detailed Description

Trend distance based on the average of values in a stream.

In this example, we consider a stream of numerical values. The reference trend P is a single number, representing an average. The TrendProcessor emits an alarm when the difference between P and the average of values over a sliding window of width 3 is greater than ½. Note that here, the distance is measured as the absolute difference between the reference average and the observed average. One can also compute the distance in terms of percentages; see AverageValueRelative.

The parameters of the TrendDistance processor in this example are as follows:

Parameter	Value
	3
	6
	½

Consider for example the input stream that starts with:

6.1, 5.9, 6, 6.7, 6.7, 6.7, …

On the first window of width 3 (6.1, 5.9, 6), the average of the values is 6, and |6-6| ½. This average lies between 6-½ and 6+½ for windows 2 and 3 as well. On the 4th window of width 3 (6.7, 6.7, 6.7), the average is 6.7, and |6-6.7| > ½; this time, the TrendDistance processor returns false.

Author

Sylvain Hallé

Definition at line 91 of file AverageValueAbsolute.java.

---

The documentation for this class was generated from the following file:

• Source/src/mining/trenddistance/AverageValueAbsolute.java