[R] mean and variance of ratio

[Dimitris Rizopoulos]

two options are the Delta method (see, e.g., function deltamethod() in 
package 'msm'), and the Bootstrap method (check package 'boot').

I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "Irene Mantzouni" <ima at difres.dk>
To: <r-help at stat.math.ethz.ch>
Sent: Monday, February 18, 2008 3:22 PM
Subject: [R] mean and variance of ratio


> Hi all!
>
>
>
> I try to estimate a statistic of the form: (x1-x2)/(y1-y2), where
> x1,x2,y1,y2 represent variable means, so each has an estimate and
> standard error associated with it.
>
> How is it possible to estimate the mean and the variance of this 
> ratio?
>
>
>
> Thank you!
>
>
> [[alternative HTML version deleted]]
>
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