Way back, some statistic guru said it reads as 80 percent confident that 80
percent of the samples will comply with the requirement.
On Monday, November 18, 2019, 03:03:12 PM EST, John Allen
<[email protected]> wrote:
Quick search on “80/80 rule history” yields (for a start!):
“It was named after it's founder, the Italian economist Vilfredo Pareto, back
in 1895. He noticed that people in society seemed to divide naturally into what
he called the “vital few,” or the top 20 percent in terms of money and
influence, and the “trivial many,” or the bottom 80 percent.”
And then
“The Pareto principle (also known as the 80/20 rule, the law of the vital few,
or the principle of factor sparsity) states that, for many events, roughly 80%
of the effects come from 20% of the causes. ... Pareto developed both concepts
in the context of the distribution of income and wealth among the population.”
So the “rule” seems to date back to the late 19th Century, although
(obviously!) not in the context of EMC control matters.
However, I’m guessing it was later adopted in that context as a reasonable
“rule of thumb” for assessing how well or not products could be assessed as
being compliant with EMC standards. I have absolutely no idea when that might
happened, but I would suggest looking for/at documents that lead up to the
earlier known emission standards in the commercial field (military field was,
and still is, a rather different one).
John E Allen
W. London, UK.
From: John Woodgate [mailto:[email protected]]
Sent: 18 November 2019 19:47
To: [email protected]
Subject: Re: [PSES] 80/80 rule
I agree: I'm almost certain that it is German in origin, and I'm sure it dates
back to the 20th Century, possibly as early as 1960.
Best wishesJohn Woodgate OOO-Own Opinions OnlyJ M Woodgate and Associates
www.woodjohn.ukRayleigh, Essex UK
On 2019-11-18 19:44, John Shinn wrote:
If my memory serves me right, as I recall, the 80/80 rule was in at least one
of the VDE standards regarding radiated emissions. I can’t recall the number or
name. This is going back to the late ‘70s or so.
John Shinn
Retired
Sent from my iPhone
On Nov 18, 2019, at 9:55 AM, John Woodgate <[email protected]> wrote:
Can someone tell me when the 80/80 rule was introduced into CISPR standards and
if possible, a bit more detail than just the date, please?
-- Best wishesJohn Woodgate OOO-Own Opinions OnlyJ M Woodgate and Associates
www.woodjohn.ukRayleigh, Essex UK
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