1 Sufficient statistics
1 Sufficient statistics AstatisticisafunctionT = r(X1,X2,···,Xn)oftherandomsampleX1,X2,···,Xn. Examples are X¯ n = 1 n Xn i=1 Xi, (the sample mean) s2 = = 1 n−1 Xn i=1 (Xi −X¯n)2, (the sample variance)T1 = max{X1,X2,···,Xn} T2 = 5 (1) The last statistic is a bit strange (it completely igonores the random sample), but it is still a statistic.
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