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--- other:inspect3d:tutorials:analysis_of_baseball_hitters [2025/01/10 20:45] – wikisysop
+++ other:inspect3d:tutorials:analysis_of_baseball_hitters [2025/01/10 20:49] (current) – wikisysop
@@ Line 127: / Line 127: @@
 To begin the **PCA** (principal component analysis), select two groups that you want to compare. Let's start by looking at **HIGHSCOOL_RIGHT_HIGH_PAV_Z** and **College_RIGHT_HIGH_PAV_Z**, select the two groups (CTRL + Click), and check the **Select All Workspaces box** if it is not already selected.
-Navigate to the toolbar at the top of the interface and select the {{:I3D_PCAOptions2.png}} **PCA dropdown**. Select the number of **PCs** (principal components) you want for your analysis, for this tutorial we will use 5 (more about this in Variance Explained), and then check the **Use Workspace Mean** if it is not already selected. Now click **Run PCA** and **Show PCA Graphs** and the graphs will appear to the right of your workspace.
+Navigate to the toolbar at the top of the interface and select the {{:I3D_PCAOptions2.png?20}} **PCA dropdown**. Select the number of **PCs** (principal components) you want for your analysis, for this tutorial we will use 5 (more about this in Variance Explained), and then check the **Use Workspace Mean** if it is not already selected. Now click **Run PCA** and **Show PCA Graphs** and the graphs will appear to the right of your workspace.
 Once your PCA graph has appeared, at the bottom right of the screen you will see six options for visualizing results of the analysis (variance explained, loading vector, workspace scores, group scores, extreme plot and PC reconstruction).See the [[Other:Inspect3D:Tutorials:Perform_Principal_Component_Analysis|Perform Principal Component Analysis]] for more information on interpreting these results.
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 **Visual Comparisons:**
-When visualizing different coordinates of the pelvic angular velocity, 3 figures can be laid out in a 3x1 grid. For now you can hide your PCA by clicking **Show PCA Graphs** in the PCA dropdown, then go to the {{:I3DShowOptions.png}} **[[Other:Inspect3D:Documentation:Dialogs:Load_Library_Dialogue#Plotting_options|Options]]** tab in the toolbar and under **Plotting options** change **Graph Rows** to 3, and leave **Graph Columns** as 1. Selecting one of the graphs will outline it with a gray border, you are then able to select which **Groups** and **Workspaces** you would like to display. In the three graphs below we have displayed **“HIGHSCHOOL_RIGHT_HIGH_PAV_”** and **“College_RIGHT_HIGH_PAV_”** in their X, Y, and Z coordinates.
+When visualizing different coordinates of the pelvic angular velocity, 3 figures can be laid out in a 3x1 grid. For now you can hide your PCA by clicking **Show PCA Graphs** in the PCA dropdown, then go to the {{:I3DShowOptions.png?20}} **[[Other:Inspect3D:Documentation:Dialogs:Load_Library_Dialogue#Plotting_options|Options]]** tab in the toolbar and under **Plotting options** change **Graph Rows** to 3, and leave **Graph Columns** as 1. Selecting one of the graphs will outline it with a gray border, you are then able to select which **Groups** and **Workspaces** you would like to display. In the three graphs below we have displayed **“HIGHSCHOOL_RIGHT_HIGH_PAV_”** and **“College_RIGHT_HIGH_PAV_”** in their X, Y, and Z coordinates.
 Looking at the anterior/posterior tilt and lateral pelvic tilt graph there is not a large visual difference between our college and high school players. **Internal/External Rotation** is what we want to focus on, where our college hitters yield a greater peak pelvic angular velocity compared to their high school counterparts. But with that being said, visualizing doesn't always tell the whole story, so let's perform a PCA (Principal Component Analysis) and continue analyzing. {{:HIGH_PAV_x_y_z.jpg}} {{:college_high_z.jpg}}
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 We can take a closer look at PC2 and PC5 to see why these principal components may be showing the most significant differences. Looking at the mean signal trace of the college and high school subjects pelvic internal/external rotation, we can see that the majority of the difference in their swings are at the peak of their pelvic velocity, and also interestingly the high school players have more internal rotation before and at the end of there swing which is represented in PC2. PC5 is less clear and harder to interpret, once again we can see that the high and low points around 80-90 on the x axis are showing the variability between the subjects peak pelvic angular velocity, and the large value around 40 seems to point out that there were more college players with an earlier swing, but the rest is hard to decipher.
-{{:PC2_baseball.jpg}}{{:PC5_baseball.jpg}}
+{{:PC2_baseball.jpg?400}}{{:PC5_baseball.jpg?400}}
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