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Semivariance Schweser ComprehQ 1L

I may have misread something here.
For the solution of Comprehensive Questions from Schweser Book1 question 1.L. the use of n = 4, being the number of values below the mean opposed to 6 being the sample size, for the semivariance equation; however in the CFAI book example they use the full sample size as n for (n1). Can anyone please explain?

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