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--- sift:gait_measures:gait_measures [2024/11/05 18:06] – wikisysop
+++ sift:gait_measures:gait_measures [2024/11/06 17:00] (current) – wikisysop
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 ==== Gait Deviation Index ====
-Sift offers a Gait Deviation Index (GDI) calculation that allows the users to find GDI scores using left/right Link_Model_Based signals in the underlying CMZ data and a normative database. Further information on GDI can be found [[Sift:Gait_Measures:Gait_Profile_Score|here]]. The GDI values are stored in the underlying c3d data files and are queried into Sift for each CMZ workspace.
+Sift offers a Gait Deviation Index (GDI) calculation that allows the users to find GDI scores using left/right Link_Model_Based signals in the underlying CMZ data and a normative database. Further information on GDI can be found [[Sift:Gait_Measures:Gait_Deviation_Index|here]]. The GDI values are stored in the underlying c3d data files and are queried into Sift for each CMZ workspace.
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 The GDI compares left and right signals within gait cycles against a normal dataset. The GDI dialog lets the user decide which events they wish to define gait cycles with.
-The **normalization points** input defaults to 51 points based on literature recommendation ( [[Sift:Gait_Measures:Gait_Profile_Score|see more here]]), but can be changed by the user.
+The **normalization points** input defaults to 51 points based on literature recommendation ( [[Sift:Gait_Measures:Gait_Deviation_Index|see more here]]), but can be changed by the user.
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 {{ Sift:Gait_Measures:GDISelections.png?600}}
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 The checkbox **"compute individual component queries after calculation"** may be checked by users if they want the GDI component results (the Global Variable Scores (GVS) for each of the 9 signals) to be automatically queried into Sift after the calculations are complete.
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+=== Display Results ===
+If the user chooses to query the GDI results, multiple groups will be generated in the Sift groups window. The GDI1 group shown is the total Gait Deviation Index for the left and right, a single metric per c3d file describing the combined scores of the Link_Model_Based signals used to define the GDI.
+Each GDI components includes their own group for each Link_Model_Based signal in the GDI definition, containing the individual GDI scores (the GVSs) of each signal per c3d file. A user may wish to compare the contributions of the individual component GVS to the total GDI score.
+The GDI results are numbered when automatically queried into Sift to prevent overriding previous GDI calculations. If Sift detects that one or multiple GDI scores have already been computed for the underlying data set, the new GDI will be numbered accordingly. Users may utilize this to compare GDI scores with varying definitions.
+GDI values are stored as metric signals, and can be plotted in Sift. The following figures show two examples of ways to compare total GDI scores and individual Left vs Right GDI scores. Further Queries could be defined to compare different conditions or sub-groups in the data set ([[Other:Inspect3D:Documentation:Dialogs:Advanced_Query_Section|defining queries]]).
+{{sift:gait_measures:gdiresults.png}} {{sift:gait_measures:leftvsrightGDI.png}}