Examination marks data set
Examination marks of 88 students on five different topics, from Mardia (1979).
data(marks)
The marks data set contains the following variables, one for each
topic in the examination:
MECH (mechanics)
VECT (vectors)
ALG (algebra)
ANL (analysis)
STAT (statistics)
All are measured on the same scale (0-100).
Edwards DI (2000). Introduction to Graphical Modelling. Springer, 2nd edition.
Mardia KV, Kent JT, Bibby JM (1979). Multivariate Analysis. Academic Press.
Whittaker J (1990). Graphical Models in Applied Multivariate Statistics. Wiley.
# This is the undirected graphical model from Edwards (2000).
data(marks)
ug = empty.graph(names(marks))
arcs(ug, check.cycles = FALSE) = matrix(
c("MECH", "VECT", "MECH", "ALG", "VECT", "MECH", "VECT", "ALG",
"ALG", "MECH", "ALG", "VECT", "ALG", "ANL", "ALG", "STAT",
"ANL", "ALG", "ANL", "STAT", "STAT", "ALG", "STAT", "ANL"),
ncol = 2, byrow = TRUE,
dimnames = list(c(), c("from", "to")))
## Not run: graphviz.plot(ug)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.