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The main role/purpose of the tie series analysis are given below shortly: 

Purpose: 

1.Understanding why changes in the past have occurred. 
2.Determining which phases of business activity must be ,measured. 
3.Analysis of the data for the cause and remove that. 
4. Selecting and compiling data to be used as measuring devices.

Role:
1. It helps in the understanding of past behavior 
2.It helps in planning future operations 
3.It helps in evaluating current accomplishments 
4.It facilitates comparison.