Date:         Fri, 5 Dec 1997 02:20:43 -0500
Reply-To:     Zihua lin <linzh@UCLINK4.BERKELEY.EDU>
Sender:       "SAS(r) Discussion" <SAS-L@UGA.CC.UGA.EDU>
From:         Zihua lin <linzh@UCLINK4.BERKELEY.EDU>
Subject:      95%CI for two-part models
Comments: To: Zihua.Lin@ncal.kaiperm.org
Content-Type: text/plain; charset="us-ascii"

 Hi,
 We need to calculate 95%CI for the expected value from the two-part models.
 
 Any information and advice is highly appreciated.
 
 The typical two-part models are as follows:
 
 Logit p = a + BX + u (p=0 or 1)
 
 Log Y = c + ZY + w (Y is continuos variable)
 
 The expected value = p * Y
 
 The question is how construct the 95%CI for p*Y.
 
Zihua Lin,