I am working on a device that measures knee joint angle. i have used the device on 17 people to test it, so i need to use the sets of data i have to identify the (Validity, and reliability) of the device.
1) Validity test: analysis of proposed device measurements in comparison to the gold standard device.
i) Inter-Rater: Comparison of the two different Instructors measurements on the same subject.
ii) Intra-Rater: analyzing the repetitive measurements conducted on the same person.
Expecting a professional display for the provided data herein. Expecting a possible implementation of cronbach Alpha, or cohen's kappa, or whatever fits the requirement to properly represents the device's Validity and Reliability.