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userguide:retentiontimerecomputing [2010/07/23 14:19] 132.168.74.230 |
userguide:retentiontimerecomputing [2010/08/02 16:49] (current) 132.168.74.230 |
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====== Retention Time Recomputing ====== | ====== Retention Time Recomputing ====== | ||
- | Cooming soon… | + | ===== Steps followed by the Retention Time Recomputing algorithm ===== |
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+ | {{ :userguide:rtrecomputingconcept1.png|}} | ||
+ | - For each 'parent' species from the selected User context (i.e. User context for which RT Recomputing is needed) | ||
+ | - Collect RTs for all final child species | ||
+ | - Can apply linear regression coefficients | ||
+ | - Can remove outliers using Grubbs method | ||
+ | * Critical values for a 0.05 significance level are used | ||
+ | * The test is used for # of values greater or equal to 3 | ||
+ | * Each time a value is removed, the test is repeated. | ||
+ | * More details on Grubb's test [[http://en.wikipedia.org/wiki/Grubbs%27_test_for_outliers|here]] | ||
+ | - Compute the 'parent' RT value from one of the following statistical method (the previous RT value is then overwritten by the new one): | ||
+ | * Average | ||
+ | * Median | ||
+ | * Weighted average (by score) | ||
+ | * Best score per identification + average | ||
+ | * Best score per identification + median | ||
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