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--- visual3d:documentation:pipeline:metric_commands:metric_stddev [2025/10/02 19:20] – [Example] wikisysop
+++ visual3d:documentation:pipeline:metric_commands:metric_stddev [2025/10/02 19:27] (current) – [Example] wikisysop
@@ Line 88: / Line 88: @@
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+====Stride Time STD Deviation====
+Here the **Metric StdDev==== command and **Metric Time Between Events** are used together to find the std deviation in the time between right heel strikes.
+First gait events must be defined:
+<code>
+Automatic_Gait_Events
+! /FRAME_WINDOW=8
+! /USE_TPR=TRUE
+! /TPR_EVENT_INSTANCE=1
+;
+</code>
+Next **Metric Time Between Events** is used to compute the time between each RHS (which is being used here as stride time):
+<code>
+Metric_Time_Between_Events
+/RESULT_METRIC_NAME=Stride_Time
+! /RESULT_METRIC_FOLDER=PROCESSED
+/EVENT_SEQUENCE=RHS+RHS
+/EXCLUDE_EVENTS=
+! /SCALE_FACTOR=1
+/GENERATE_MEAN_AND_STDDEV=FALSE
+! /APPEND_TO_EXISTING_VALUES=FALSE
+;
+</code>
+Finally, **Metric StdDev** is used to find the std deviation in stride time across all trials:
+<code>
+Metric_StdDev
+/RESULT_METRIC_FOLDER=PROCESSED
+/RESULT_METRIC_NAME=Stride_Time_SD
+! /APPLY_AS_SUFFIX_TO_SIGNAL_NAME=FALSE
+/SIGNAL_TYPES=METRIC
+/SIGNAL_FOLDER=PROCESSED
+/SIGNAL_NAMES=Stride_Time
+! /COMPONENT_SEQUENCE=
+/EVENT_SEQUENCE=
+/EXCLUDE_EVENTS=
+! /GENERATE_MEAN_AND_STDDEV=TRUE
+! /GENERATE_MEAN_AND_STDDEV_ACROSS_SUBJECTS=FALSE
+! /APPEND_TO_EXISTING_VALUES=FALSE
+;
+</code>
+The results should look similar to below:
+{{:visual3d:documentation:pipeline:metric_commands:stride_stddev.png?600|}}