Question: What should be criteria to detect a level shift in a time series data? a. The observation is higher or lower than 15% of the

What should be criteria to detect a level shift in a time series data?

a. The observation is higher or lower than 15% of the previous value

b. The observation is higher or lower than 10% of the previous value

c. Absolute value of Tracking Signal is less than 0.5 indicates level shift

d. Absolute value of Tracking Signal is greater than 0.5 indicates level shift

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