Options

GSP - Gap, Window

MBMMBM Member Posts: 23 Contributor I
edited November 2018 in Help

Hey all, 

 

does anybody have a tip on how to set the parameters correctly in the GSP-Operator? 

What does windwow and Gap (min/max) exactely mean? Or has anybody good literature where it is explained? It cannot be so hard to explain it in max 5 sentences if someone knows how it works. 

 

Best wishes

Marcel

Answers

  • Options
    jwpfaujwpfau Employee, Member Posts: 295 RM Engineering
    min gap
    Minimal timespan between two transactions
    max gap
    Maximal timespan between two transactions
    window size
    Transactions inside this timespan are also seen as a single transaction
    min support
    Percentage of sequences that must contain a pattern
    If you use window size, it might make sense to also define a min gap with the same value, so that all transactions in this timespan only appear as the single merged transaction. With the min support you should start as high as possible (0,9x) and slowly work down, otherwise the algorithm will generate too many combinations and run forever.
Sign In or Register to comment.