Web Analytics data collection is actually driven by the Usage and Health service, and then it mines the data to help administrators improve their Sites and Search.
To collect data the Usage and Health Service, aggregates the info thru Usage definitions which you can see in Central Admin.
Using the Web Analytics Service these results are aggregated into reports at these levels
By Default we have the following reports
You can manipulate the Usage Definitions using the PowerShell commands
Thoughts and Suggestions
Capacity requirements for the Web Analytics Shared Service in SharePoint Server 2010
Reporting and usage analysis overview (SharePoint Server 2010)
Web Analytics in SharePoint 2010: Insights into Reports and Metrics
cool blog post!!!
I can not see below three events.
Sandboxed Requests, Workflow,Sandboxed Requests Monitored Data
What could be the problem why i can not see above three events?
I'm sorry for my tardy response, but honestly this is not something that will get resolved over comments. I would turn up ULS logging and start digging thru that to find a place to start troubleshooting from, I would be looking for issues with permissions, or an error with an object. I would also verify my config in Central Admin.
Hopefully you have already solved this but if not hopefully this will help you.