Description Usage Arguments Value Author(s) References See Also Examples
A bagging and subsampling version of logic regression. Currently available for the
classification, the linear regression, and the logistic regression approach
of logreg
. Additionally, an approach based on multinomial logistic regressions as
implemented in mlogreg
can be used if the response is categorical.
1 2 3 4 5 6 7 8 9  ## Default S3 method:
logic.bagging(x, y, B = 100, useN = TRUE, ntrees = 1, nleaves = 8,
glm.if.1tree = FALSE, replace = TRUE, sub.frac = 0.632,
anneal.control = logreg.anneal.control(), oob = TRUE,
onlyRemove = FALSE, prob.case = 0.5, importance = TRUE,
addMatImp = FALSE, fast = FALSE, rand = NULL, ...)
## S3 method for class 'formula'
logic.bagging(formula, data, recdom = TRUE, ...)

x 
a matrix consisting of 0's and 1's. Each column must correspond to a binary variable and each row to an observation. Missing values are not allowed. 
y 
a numeric vector or a factor specifying the values of a response for all the observations
represented in 
B 
an integer specifying the number of iterations. 
useN 
logical specifying if the number of correctly classified outofbag observations should
be used in the computation of the importance measure. If 
ntrees 
an integer indicating how many trees should be used. For a binary response: If For a continuous response: A linear regression model with For a categorical response: n.lev1 logic regression models with 
nleaves 
a numeric value specifying the maximum number of leaves used
in all trees combined. See the help page of the function 
glm.if.1tree 
if 
replace 
should sampling of the cases be done with replacement? If

sub.frac 
a proportion specifying the fraction of the observations that
are used in each iteration to build a classification rule if 
anneal.control 
a list containing the parameters for simulated annealing.
See the help page of 
oob 
should the outofbag error rate (classification and logistic regression) or the outofbag root mean square prediction error (linear regression), respectively, be computed? 
onlyRemove 
should in the single tree case the multiple tree measure be used? If 
prob.case 
a numeric value between 0 and 1. If the outcome of the
logistic regression, i.e.\ the class probability, for an observation is
larger than 
importance 
should the measure of importance be computed? 
addMatImp 
should the matrix containing the improvements due to the prime implicants
in each of the iterations be added to the output? (For each of the prime implicants,
the importance is computed by the average over the 
fast 
should a greedy search (as implemented in 
rand 
numeric value. If specified, the random number generator will be set into a reproducible state. 
formula 
an object of class 
data 
a data frame containing the variables in the model. Each row of 
recdom 
a logical value or vector of length 
... 
for the 
logic.bagging
returns an object of class logicBagg
containing
logreg.model 
a list containing the 
inbagg 
a list specifying the 
vim 
an object of class 
oob.error 
the outofbag error (if 
... 
further parameters of the logic regression. 
Holger Schwender, [email protected]
Ruczinski, I., Kooperberg, C., LeBlanc M.L. (2003). Logic Regression. Journal of Computational and Graphical Statistics, 12, 475511.
Schwender, H., Ickstadt, K. (2007). Identification of SNP Interactions Using Logic Regression. Biostatistics, 9(1), 187198.
predict.logicBagg
, plot.logicBagg
,
logicFS
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36  ## Not run:
# Load data.
data(data.logicfs)
# For logic regression and hence logic.bagging, the variables must
# be binary. data.logicfs, however, contains categorical data
# with realizations 1, 2 and 3. Such data can be transformed
# into binary data by
bin.snps<make.snp.dummy(data.logicfs)
# To speed up the search for the best logic regression models
# only a small number of iterations is used in simulated annealing.
my.anneal<logreg.anneal.control(start=2,end=2,iter=10000)
# Bagged logic regression is then performed by
bagg.out<logic.bagging(bin.snps,cl.logicfs,B=20,nleaves=10,
rand=123,anneal.control=my.anneal)
# The output of logic.bagging can be printed
bagg.out
# By default, also the importances of the interactions are
# computed
bagg.out$vim
# and can be plotted.
plot(bagg.out)
# The original variable names are displayed in
plot(bagg.out,coded=FALSE)
# New observations (here we assume that these observations are
# in data.logicfs) are assigned to one of the classes by
predict(bagg.out,data.logicfs)
## End(Not run)

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