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Approximate Analysis is a way to speed up log analyzing process and save your time. It's recommended for logs which size is more than 1 Gb. Also, you can use Approximate Analysis on slow machines to speed up log analyzing process.
How to use Approximate Analysis:
Click File - Options and check Approximate Analysis checkbox on General tab. If needed, edit Tolerance value.
Approximate analysis tolerance:
Approximate analysis tolerance value is a factor which will influence on limiting length of the list value and length of the list after reduction value. Limiting length of the list value is a maximal lenth of the list after that the list will be reducted. It is expressed in a formula: (100+Tolerance)*Limit where Limit is a number of items to display of each report. Length of the list after reduction value is a lenth of the list after reduction. It is expressed in a formula: (100+Tolerance)*Limit/10
How it works:
For example you have referrer sites report with next list of values:
where 255, 1225, 457 is a number of users came from altavista, google, yahoo site accordingly. When ALA analyzing the list, it will be sorted:
the list of 10 high valued sites will be included and shown in a report (Limit value = 10).
When Approximate analysis is enabled, for example tolerance value=10 and limit=10, the limiting length of the list value will be (100+10)*10=1100 and length of the list after reduction value will be (100+10)*10/10=110. ALA analyze file and when sites number will be more than limiting length of the list value, the list will be reducted to the list after reduction value. So, when sites number will be more than 1100 sites, it will be reducted to 110 sites. After that if log file contains more sites, they wiil be added to that 110 site and once again, when sites number will be more than 1100 sites it will be reducted. At the end of analyzing, the list of 10 high valued sites will be included and shown in a report.
Approximate analysis speeds up log analyzing time and saves your time.
Note:Approximate analysis gives you approximate values in your reports. If you need exact values, please turn it off.
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