若跑一個最小平方法,得到下列數據: ^ 5 ^ ^ 3 1 1 β=[-4 ] and Σ= σ^2(X'X)^(-1)=[ 1 2 1 ] 2 1 2 3 a.On the basis of this information, how would you estimate β, if you believed that β_1+β_2=β_3 and β_2+β_3=0? b.What rationale would you give for your estimator? 這是今年清大經研的統計 我知道那些矩陣代表的意思 可是a.b.小題我完全不知道它想問什麼 麻煩了解的人救救我~感謝~~~ 另外還有兩個小問題 1.若以無母數的方法作卡方齊一性檢定,需要什麼重要的假設? 印象中沒聽過需要什麼假設,也麻煩知道的人賜教~ 2.In a certain community, 8% of all adult over 50 have diabetes. If a health service in this community correctly diagnoses 95% of all persons with diabetes as having the disease and incorrectly diagnoses 2% of all persons without diabetes as having the disease, find the probabilities that a.the community health service will diagnose an adult over 50 as having diabetes. b.a person over 50 dianosed by the health service as having diabetes actually has the disease. 這一題一下子adult一下子又person,搞的我糊裡糊塗 我的作法是a.0.08*0.95+0.92*0.02 b.(0.08*0.95)/(0.08*0.95+0.92*0.02) 不知道有沒有錯誤~感謝~~~^^ --

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