About how to use RATEEST interval and ewmalog

Hi

On 22 Nov I did ask for an explanation on how to use --rateest-interval and --rateest-ewmalog but no one answered. My original question can be seen in [1] and is the following:

What is --rateest-interval and --rateest-ewmalog?

--rateest-interval amount{s|ms|us}
Rate measurement interval, in seconds, milliseconds or
microseconds.

--rateest-ewmalog value
Rate measurement averaging time constant.

I'm using interval 1.0s and ewmalog 2.0s but I don't understand how these parameters works together.

Any further explanation?

[1] http://comments.gmane.org/gmane.comp.security.firewalls.netfilter.general/45285