Research on confirming segment points of time series
Yikun Zhang · Computer Engineering and Applications Journal · 2010
In the existing algorithms of piecewise linear representation for time series,local extremum points always are regarded as segment points,but the changement of time series states can't be depicted completely only by them.So according to the idea of piecewise linear of time series,new segment points are brought in after local extremum points are fixed,which can acquire high fitting precision.The difference of slopes is used to reflect state changements and by comparing with slopes of adjacent sequence segments,new segment points can be confirmed.Lastly this method leads to much less fitting error and better practicability.