Differences

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--- userguide:retentiontimerecomputing [2010/07/23 14:19]
132.168.74.230
+++ userguide:retentiontimerecomputing [2010/08/02 16:49] (current)
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@@ Line 1: / Line 1: @@
 ====== Retention Time Recomputing ======
-Cooming soon…
+===== Steps followed by the Retention Time Recomputing algorithm =====
+{{ :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

hEIDI