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--- sift:principal_component_analysis:local_outlier_factor_dialog [2024/07/12 13:58] – created sgranger
+++ sift:principal_component_analysis:local_outlier_factor_dialog [2024/11/15 20:19] (current) – [Dialog] wikisysop
@@ Line 1: / Line 1: @@
-====== Local_Outlier_Factor_Dialog ======
+====== Local Outlier Factor Dialog ======
-[[Sift:Principal_Component_Analysis:Outlier_Detection_for_PCA#Local_Outlier_Factor|The Local Outlier Factor]] is a machine learning algorithm that detects outliers by using nearest neighbour distances (k-nearest neighbour). The LOF finds points that are outliers relative to local clusters. The LOF outlier score takes into account the relative density of the data points to the local clusters.
+[[Sift:Principal_Component_Analysis:Outlier_Detection_for_PCA#Local_Outlier_Factor|The Local Outlier Factor(LOF)]] is a machine learning algorithm that detects outliers by using nearest neighbour distances (k-nearest neighbour). The LOF finds points that are outliers relative to local clusters. The LOF outlier score takes into account the relative density of the data points to the local clusters.
 The Local Outlier Factor is found on the toolbar and under 'Outlier Detection Using PCA' in the Analysis menu.
-{{LOF_button.png}}
+{{:LOF_button.png}}
 ==== Dialog ====
-{{LOF_dlg.png}}
+{{ :LOF_dlg.png}}
 The Local Outlier Factor using PCA allows the user to automatically search the data and identify traces that are outside the norm. The search for outliers can be done by Combined Groups, Group, and Workspaces. Users can decide if they want to auto-exclude any outliers that are detected in the groups or workspaces. Users can specify conditions of the LOF technique, including number of nearest neighbours, thresholds, p-values, and outlier percentage.
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   * **Outlier Criteria:** How outliers should be determined:
     * **Manual:** Any outlier above a specific LOF threshold is determined to be an outlier.
+      * **Manual Outlier Threshold:** If Manual above, the specific LOF threshold that determines if a PC score is an outlier.
     * **Sequential Grubbs' Test:** Uses the Grubbs' test to identify a threshold for a approximate percentage of outliers at a specified alpha value.
-  * **Manual Outlier Threshold:** If Manual above, the specific LOF threshold that determines if a PC score is an outlier.
+      * **Grubbs' Test Alpha:** The alpha value corresponding to the Grubbs' test.
-  * **Grubbs' Test Alpha:** The alpha value corresponding to the Grubbs' test.
+      * **Outlier Percentage (approx.):** The approximate % of outliers that are in the dataset.
-  * **Outlier Percentage (approx.):** The approximate % of outliers that are in the dataset.
   * **Scale Data To % Variability:** Scale the distance measures to be proportional to the variance along each PC axis.
-  * **Show LOF on workspace scores:** If the LOF should be shown on the Workspace Scores graph.
+  * **Show LOF on workspace scores:** If the LOF scores should be shown on the Workspace Scores graph.
 ==== Results ====
 The LOF results appear upon completion of running the test.