is about
information content entity
contingency table
2
Alejandra Gonzalez-Beltran
Orlaith Burke
Philippe Rocca-Serra
STATO, adapted from wikipedia (http://en.wikipedia.org/wiki/Contingency_table)
a contigency table is a data item which displays the (multivariate) frequency distribution of the possible values of categorical variables.
The first row of the table corresponds to categories of one categorical variable, the first column of the table corresponds to categories of the other categorical variable, the cells corresponding to each combination of categories is filled with the observed occurences in the sample being considered.
The table also contains marginal total (marginal sums) and grand total of the occurences
The term contingency table was first used by Karl Pearson in "On the Theory of Contingency and Its Relation to Association and Normal Correlation", part of the Drapers' Company Research Memoirs Biometric Series I published in 1904.
xtabs(formula = ~., data = parent.frame(), subset, sparse = FALSE,
na.action, exclude = c(NA, NaN), drop.unused.levels = FALSE)
http://stat.ethz.ch/R-manual/R-patched/library/stats/html/xtabs.html
flat contingency tables:
ftable(x, ...)
http://stat.ethz.ch/R-manual/R-patched/library/stats/html/ftable.html
categorical variable
ready for release