Description Usage Arguments Details Value Author(s) References See Also Examples
Performs a test of conditional independence for every pair of variables.
1 2 3 4 5 6 7 | ## S4 method for signature 'matrix'
qpAllCItests(X, I=NULL, Q=NULL, pairup.i=NULL, pairup.j=NULL,
long.dim.are.variables=TRUE, exact.test=TRUE,
use=c("complete.obs", "em"), tol=0.01,
return.type=c("p.value", "statn", "all"), verbose=TRUE,
R.code.only=FALSE, clusterSize=1, estimateTime=FALSE,
nAdj2estimateTime=10)
|
X |
data set from where to estimate the non-rejection rates. It can be an ExpressionSet object, a data frame or a matrix. |
I |
indexes or names of the variables in |
Q |
indexes or names of the variables in |
pairup.i |
subset of vertices to pair up with subset |
pairup.j |
subset of vertices to pair up with subset |
long.dim.are.variables |
logical; if |
exact.test |
logical; if |
use |
a character string defining the way in which calculations are done in the
presence of missing values. It can be either |
tol |
maximum tolerance controlling the convergence of the EM algorithm employed
when the argument |
return.type |
type of value returned by this function. By default |
verbose |
show progress on the calculations. |
R.code.only |
logical; if |
clusterSize |
size of the cluster of processors to employ if we wish to
speed-up the calculations by performing them in parallel. A value of 1
(default) implies a single-processor execution. The use of a cluster of
processors requires having previously loaded the packages |
estimateTime |
logical; if |
nAdj2estimateTime |
number of adjacencies to employ when estimating the
time of calculations ( |
When I
is set different to NULL
then mixed graphical model theory
is employed and, concretely, it is assumed that the data comes from an homogeneous
conditional Gaussian distribution. By default, with exact.test=TRUE
, an
exact test for conditional independence is employed, otherwise an asymptotic one
will be used. Full details on these features can be found in Tur, Roverato and Castelo (2014).
A list with three entries called p.value
, statistic
and n
corresponding to a dspMatrix-class
symmetric matrix of p-values for the null
hypothesis of coindtional independence with the diagonal set to NA
values,
an analogous matrix of the statistics of each test and of the sample sizes, respectively.
These returned values, however, depend on the setting of argument return.type
which,
by default, enables only returning the matrix of p-values.
If arguments pairup.i
and pairup.j
are employed, those cells outside
the constrained pairs will get also a NA
value.
Note, however, that when estimateTime=TRUE
, then instead of the matrix
of estimated non-rejection rates, a vector specifying the estimated number of
days, hours, minutes and seconds for completion of the calculations is returned.
R. Castelo, A. Roverato and I. Tur
Castelo, R. and Roverato, A. A robust procedure for Gaussian graphical model search from microarray data with p larger than n, J. Mach. Learn. Res., 7:2621-2650, 2006.
Tur, I., Roverato, A. and Castelo, R. Mapping eQTL networks with mixed graphical Markov models. Genetics, 198:1377-1393, 2014.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | library(mvtnorm)
nVar <- 50 ## number of variables
maxCon <- 3 ## maximum connectivity per variable
nObs <- 30 ## number of observations to simulate
set.seed(123)
A <- qpRndGraph(p=nVar, d=maxCon)
Sigma <- qpG2Sigma(A, rho=0.5)
X <- rmvnorm(nObs, sigma=as.matrix(Sigma))
alltests <- qpAllCItests(X, verbose=FALSE)
## distribution of p-values for the present edges
summary(alltests$p.value[upper.tri(alltests$p.value) & A])
## distribution of p-values for the missing edges
summary(alltests$p.value[upper.tri(alltests$p.value) & !A])
|
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