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I have a data-set which is collected using two devices (A and B) to measure the same variable, for 10 participants during 5 different types of activities . Each activity goes for 15 minutes and there are 15 data points collected for each activity per participant. ​

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For each participant I have 75 (15 per activity X 5 activities) measurements each from device A and device B for the same variable. This gives me 750 measurements all together for each device.

I want to analyse the agreement between the device A and device B measurements, measuring the same variable. If I’m comparing the two dependent variables (device A and device B measurements) does this study fall under a longitudinal study with repeated measures?

For agreement analysis I intend to use methods Interclass correlation coefficient (ICC) and Bland-Altman analysis. How do I adopt these methods for my study design?

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