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Re: st: RE: Re: How to calculate this conditional mean
Thanks to Nick's excellent support, I have found the solution. Thank
you so much, Nick!
On 10/31/06, Nick Cox <firstname.lastname@example.org> wrote:
> See the FAQ
> How do I create variables summarizing for each individual
> properties of the other members of a group?
> Quang Nguyen
> > I have the following data set:
> > > Vessel Date of landing Revenue
> > > 1 July/05/2004
> > > 2
> > > 3
> > > .....
> > >
> > I would like to create a variable whose value is the average revenue
> > of all other vessels having the same date of landing. For instance,
> > for vessel 1, this variable will be the average revenue of all other
> > vessels (not including vessel 1) whose date of landing is
> > July/05/2004.
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