How to create an average of the latest collects using CDEF

[jefpalma]

Hi,

I use Cacti to monitor the Internet links of my company and I need to create a CDEF function that get the latest 14 collects and create an average of it.

Have anyone tried to create something like?

I need to check if the current traffic is similar with the average of the last 14 days, for example. If the current traffic was below of the average, it can indicate that our clients are facing some access problems.

Thanks.