作者Cloie (交集与联集的契机)
看板NCCU07_STGRA
标题[课业] 存活期末考第4题
时间Sun Jan 18 21:57:07 2009
各位有修存活的同学们
寄信给丽霞老师的信已回，所以存活第4题已改题目，请大家收信，注意红色部分
4. Let T be the time in months to death due to AIDS since diagnosed
as being HIV positive. Let X be an indicator, where X=1 if using
针筒注射毒品before. The estimated coefficients under the exponential
regression model from SAS proc lifereg ( dist=
exponential) are:
Variable Estimate Std Err
Intercept 3.0239 0.1543
X -0.8557 0.2239
And Cov(beta0_hat,gamma_hat)=
-0.01040
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开琼筵以坐花，飞羽觞而醉月。
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