|
North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Pricing model for transit services
On Mon, Sep 23, 2002 at 04:07:47PM -0400, Richard A Steenbergen wrote: > On Mon, Sep 23, 2002 at 12:50:17PM -0700, Lane Patterson wrote: > > > And there are at least 4 ways of computing 95th percentile, though I'm sure > > there've already been threads on this. > > There is only one way, anyone else is computing "something else" that they > just happen to bill with. But this sounds like a subject for the NANOG > FAQ. :) I think the problem is not that there are multiple definitions of how to calculate the 95th percentile of a sample population, but that different peoples' sample populations are constructed in different ways. I have seen billing based on: max(95th(to_cust), 95th(from_cust)) 95th(max(to_cust, from_cust)) 95th(to_cust + from_cust) 95th(to_cust) all referred to by different people as "95th percentile billing". There are also many different ways of obtaining values for "to_cust" and "from_cust", just to keep things interesting. I would be interested to find out how many customers of services billed by "95th percentile" do their own measurements and compare them with the bill. I suspect the number is not large. Maybe that's why most providers don't find it necessary to spell out exactly what calculations they are doing in order to arrive at a monthly figure with a dollar sign in front of it. Joe
|