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  1. M

    Calculation of deviation

    Hey there, I Am dealing with Calculation of deviation of 7 groups (each group represent year of study) , each group contain n_i obs of students and i'd like to calculate the total variance of their grades. The mean was calculated: sum { w_i * mu_i} / (sum {n_i}) where w_i is the proportion...
  2. M

    minimal sufficient statistics

    Thank you, where can i find a proof for this theorem?
  3. M

    minimal sufficient statistics

    Hello all. Is the theorem about minimal sufficient statistics by the factorization theorem is a statement of if and only if? Let theta be an unknown parameter, if for sufficient statistic s(x) i previously found, and for the likelihood's ratio of L(x,theta)/L(y,theta). If i show that s(x)=s(y)...