Interaction of a dynamic number of factors

Try this:

ftable(CO2[1:3])

Treatment nonchilled chilled
Plant Type
Qn1   Quebec                         7       0
      Mississippi                    0       0
Qn2   Quebec                         7       0
      Mississippi                    0       0
Qn3   Quebec                         7       0
      Mississippi                    0       0
Qc1   Quebec                         0       7
      Mississippi                    0       0
Qc3   Quebec                         0       7
      Mississippi                    0       0
Qc2   Quebec                         0       7
      Mississippi                    0       0
Mn3   Quebec                         0       0
      Mississippi                    7       0
Mn2   Quebec                         0       0
      Mississippi                    7       0
Mn1   Quebec                         0       0
      Mississippi                    7       0
Mc2   Quebec                         0       0
      Mississippi                    0       7
Mc3   Quebec                         0       0
      Mississippi                    0       7
Mc1   Quebec                         0       0
      Mississippi                    0       7

Hi, I have a dynamic table structure consisting of N factors (e.g. columns
Factor_1, Factor_2,..Factor_N).

I want to construct a table that has as rows the level combinations of
factors F_1..F_n-1, and as columns the levels of the factor Fn. The cells of
the table would contain the number of cases that correspond to these level
combinations. How can I do this?

--
View this message in context: http://www.nabble.com/Interaction-of-a-dynamic-number-of-factors-tp23021835p23021835.html
Sent from the R help mailing list archive at Nabble.com.

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

do you mean something like this:

f1 <- gl(2, 2, length = 15)
f2 <- gl(3, 2, length = 15)
f3 <- gl(4, 2, length = 15)
f4 <- gl(5, 2, length = 15)

fcomb <- interaction(f1, f2, f3)
table(fcomb, f4)


I hope it helps.

Best,
Dimitris

Hi, I have a dynamic table structure consisting of N factors (e.g. columns
Factor_1, Factor_2,..Factor_N). 

I want to construct a table that has as rows the level combinations of
factors F_1..F_n-1, and as columns the levels of the factor Fn. The cells of
the table would contain the number of cases that correspond to these level
combinations. How can I do this?

Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014