On Sun, 7 Oct 2007, Öhagen Patrik wrote:
Sorry for the vaugness.
I have text data (exam grades, say) for different courses and I want to
table them. In my table I want the frequency for the lowest grade first
and the other frequencies in increaseing (grade) order. Some frequencies
might be zero but I want to include those empty cells in my table.
table() does not omit empty cells. What is likely to be happening is that
you have missing levels in the factor you supply or table() creates. The
way do this is to make your own ordered factor. E.g.
marks <- c(1,5,3,4,5,6)
table(ordered(marks, levels=1:6))
1 2 3 4 5 6
1 0 1 1 2 1
I hope that made sense?
Thank you in advance!
Cheer, Patrik
-----Ursprungligt meddelande-----
Från: Prof Brian Ripley [mailto:[EMAIL PROTECTED]
Skickat: den 7 oktober 2007 09:11
Till: Öhagen Patrik
Kopia: [EMAIL PROTECTED]
Ämne: Re: [R] Controlling the Output from table()
On Sun, 7 Oct 2007, Öhagen Patrik wrote:
Dear All,
I would like to have some controll over the output from the function
table(). I want to controll the order of the cells and I want to include
empty cells (if any).
Example: I have ordinal data wich takes the values 1,2,3....N but I want
the output from table to put the frequencies in a different order, say,
3,7,1,4.... and I want to include categories with zero frequency.
How is that done?
See ?tabulate. You can reorder the result via indexing: I don't follow
what you want and you did not give us an example. (For example, is
'ordinal data' represented by an ordered factor or by an integer vector?)
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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