For each recording, the two elements were added together to form the final null distribution, :
where represents the sample variance of , , and . The distribution in question depends on the standardised length of the analysed recording. This is because in practice there were 3 different versions of : one for each standard MC signal length (350, 400, 500 s).
The test statistic is then obtained by standardizing by the mean and standard deviation of the final normal null distribution ,
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