How does F5 Analytics aggregate transaction data?

According to previous discussion, we have learned the following:

• First 2 hours it keeps data aggregated every 5 minutes

   

• After 8 hours it keeps data aggregated every 1 hours (60 minutes)

   

• After 2 days it keeps data aggregated every 4 hours (240 minutes)

   

• After 2 weeks it keeps data aggregated every 24 hours

   

• After 2 months it keeps data aggregated every 1 week

   

• After 1 year it keeps data aggregated every 4 weeks

   

However, how exactly do they aggregate those data? Do they average the TPS in the time interval?

I am seeing some inconsistency in my data. For example:

This is what I saw when viewing the data on 9/26.

• 9/25/2014 04:00:00 TPS = 0
• 9/25/2014 08:00:00 TPS = 0
• 9/25/2014 12:00:00 TPS = ~12k
• 9/25/2014 16:00:00 TPS = ~12k
• 9/25/2014 20:00:00 TPS = ~12k
• 9/26/2014 00:00:00 TPS = 0

And this is what I am seeing right now

• 9/25/2014 00:00:00 TPS = 1.2K
• 9/26/2014 00:00:00 TPS = 1k

What is going on here?