Advice to best analyze a balance task

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I am conducting a research study where subjects are sitting in a simulated wave motion cabin on top of a 6 DOF device to try to get them sick. With this I am having the subjects complete some cognitive tasks during the ride. One of the tasks is having the subjects hold a board and try to keep it level to earth. Subjects are given the example that is a glass of water is sitting on top of the board you do not want it to spill. There is an IMU placed on the board gathering their inputs. I am trying to figure out what the best way is to analyze how well the subjects did on keeping the board level. I tried RMS error and it was really messy. Any advice would be helpful. I attached a figure of the subject IMU inputs as well as reference IMU that is capturing the movement of the simulator.
Austin Bollinger
Austin Bollinger on 28 Sep 2022
It works in a sense, but I just don't think RMS is the way to go.
Bad: Roll 6.4533 Pitch 13.0291
Good: Roll 2.6608 Pitch 3.2351
Here is two of the subjects. The subject that did the task very well had a low RMS acorss the trial, which is what I am looking for, but the subject that did bad had a higher RMS than even the reference values. The deviation from 0. It works in a sense that it does tell me this subject did awful at the task.

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Accepted Answer

Image Analyst
Image Analyst on 28 Sep 2022
If you don't like rms then maybe use mad - the mean or median deviation of the absolute value of the signal. It's like RMS but less influenced by extreme values.

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