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Update analyzer
Update of a search engine is the process of search results renewal. Some sites make it to the top 10, some sites "sink". Every search engine has its own update style which becomes clear in the corresponding analyzer. The search engine update analyzer monitors daily the top ten links referring to 140 queries to check the number of sites that changed their positions, and how much the positions have changed. →
The summary index of the update is calculated as follows:
Example 1
For Day 1, a certain query has the following Top 10:
C1, C2, C3, C4, C5, C6, C7, C8, C9, C10.
For Day 2, the same query has this Top 10:
Cn, C1, C2, C3, C4, C5, C6, C7, C8, C9.
Example 2
For Day 1, a certain query has the following Top 10:
C1, C2, C3, C4, C5, C6, C7, C8, C9, C10.
For Day 2, the same query has this Top 10:
Cn1, Cn2, Cn3, Cn4, Cn5, Cn6, Cn7, Cn8, Cn9, Cn10.
Let N2i be the number in the 2nd Top 10 that was ith by the page order of the first Top 10.
If the 2nd Top 10 did not have ith page, then N2i=11.
The update indicator is calculated using the formula:
10
S Abs(i-N2i)/100
i=1
Where:
S represents the sum;
Abs is the absolute value of a number.
If N2i=11 (ith page from the first Top 10 did not make it into the second Top 10), then Abs(i-N2i)=10.
For the two examples above, the suggested calculation method gives the following results:
Example 1
((2-1)+(3-2)+(4-3)+(10-9)+10)/100 = 0.19 (19%)
Example 2
10*10/100 = 1.00 (100%)
Besides, additional parameters are calculated: the number of sites which disappeared from the search results and those which changed their positions.
This analyzer has no "valuation". The results can be interpreted in two ways: a search engine that has frequent large updates could be considered more up-to-date; a search engine with rare updates can be considered more stable and predictable. The informer of this analyzer sorts the search engines in the ascending order of update level.
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