Peter Dalgaard wrote:
> Rainer M Krug <[EMAIL PROTECTED]> writes:
>
>> Hi
>>
>> I know this is a basic question and I know I have done it before but I
>> can't find the answer any more.
>>
>> I have a data set, say:
>>
>> F1, F2, Value
>>
>> F1 and F2 are Factors.
>>
>> I would like to plot
>>
>> plot(TheCombinationOf(F1, F2), Value)
>>
>> I remember there was a function for TheCombinationOf() but I don't
>> remember the name.
>>
>> I could create a new factor based on F1 and F2, but I would prefer the
>> other soluytion.
>>
>> Any help welcome,
>
> F1:F2
> interaction(F1,F2)
>
> There are some differences so lookup the help page for the latter.
>
Thanks a lot
Rainer
--
Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation
Biology (UCT)
Department of Conservation Ecology and Entomology
University of Stellenbosch
Matieland 7602
South Africa
Tel: +27 - (0)72 808 2975 (w)
Fax: +27 - (0)21 808 3304
Cell: +27 - (0)83 9479 042
email: [EMAIL PROTECTED]
[EMAIL PROTECTED]
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