1.1 Take the data used in Example 1.1. Using lags h = (1,1) and h = (1,−1), verify that |Dh| = 6 in both cases, and that s(1,1) = −8.22, g(1,1) = 41.58, s(1,−1) = 11.36, g(1,−1) = 3.50. Also show that s(0,0) = 30.81. Hence confirm Eq. (1.3) for this data set; namely g(1,1) ≠ s(0,0) − s(1,1) and g(1,−1) ≠ s(0,0) − s(1,−1). That is, that the population identity (1.1) does not hold in the sample case for this data set.