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I've written 20/80 principles before, and here's a new mention:
The 20/80 law is also called the 28 law, the Baledo law. The law of Baledo was invented by Baledo, an Italian economist, at the end of 19th century in early 20th century. In his view, in any group of things, the most important only a small part, about 20%, the remaining 80%, although the majority, but is secondary, and therefore called the 28 law.
In search engine design, it can be said that most search engine results on the first page of 80% results are the same, the difference is only 20%. But it is this from make different.
This 20% difference is also the difference between different search engines, to improve the 20% will be critical to a search engine.
On the other hand, for a search engine to improve, for example, you can spend 20% of the effort to achieve 80% effect, and to improve the remaining 20% of the effect may cost 80% of the effort.
A simple example, a search engine is now relatively rudimentary, perhaps participle and search-related accuracy rate of about 80%, want to further improve, perhaps to adjust 40, 50 parameters, adjust a lot of factors, consider a lot of algorithms, spent a great deal of energy after the discovery only raised a little, and then adjusted, so thrice, Perhaps a long time later found that there are 90%, this 10% is a big breakthrough, but the effort to spend than from 0% to 80% a lot more.
Search engine parameters of the gap may be only a few percentage points, but these few percentage points is the real difference, it is true to create winners and losers.
From a search perspective, the 20 80 rule has another meaning, 80% of the search focused on 20% of a small number of keywords, that is, 20% of the search terms accounted for 80% of the overall search traffic. The frequency of search can be obtained by the daily statistics of search engines, and in some special cases, these distributions can be used to perform very good corrective work on search engines.
