Google analytics custom variables 笔记

Custom variable:

• Is a name-value pair
• Custom variables can help to define additional segments
• There are 3 levels in GA's visitor interaction model
• visitor
• session
• page
• _setCustomVar(index, name, value, opt_scope)
• index - slot 1 to 5, required
• opt_scope - 1,2,3 default to page scope 3
• You can _deleteCustomVar(index) to remove a CV
• Call _setCustomVar() before pageView or event

Page level:

• A single pageView, event, or transaction call
• Variable slots can be reused on one page, but only the last one will apply in that case
• For any single page, only up to 5 CV can be used

Session level:

• Apply to the current session - decided by cookies
• Last set value in the session scope CV win
• If use the same slot, session scoped CV will override page scoped CV(see note 1)
• For any given session, up to 5 CV can be used

Visitor level:

• Current and future session for the lift of visitor cookies
• Last set value in the last session win
• Up to 5

Note 1: When use same slot number for page and session CV, the page level CV will not be recorded.

Note 2: Visitor level CV does not override page level CV.