ELMCoxEN: SurvELM ELMCoxEN

In whcsu/SurvELM: Survival Anlalysis with Extreme Learning Machines

Description

An Ensemble of Regularized Cox Extreme Learning Machine Model

Usage

ELMCoxEN(x, y, mtry = floor(sqrt(ncol(x))), enlen = 100,
  Kernel_type = "lin_kernel", Kernel_para = c(2, 1), ...)

Arguments

x	The covariates(predictor variables) of training data.
y	Survival time and censored status of training data. Must be a Surv survival object
mtry	Number of covariates within the subset tp build a base ELMCox model.
enlen	Number of base models within the ensemble. Default is 100.
Kernel_type	Type of kernel matrix. Currently four options avaibable. "RBF_kernel",a RBF kernel;"lin_kernel" , a linear kernel;poly_kernel ,a polynomial kernel;sigmoid_kernel, a sigmoid kernel. Default is "lin_kernel".
Kernel_para	Parameters for different types of kernels. A single value for RBF and linear kernels. A vector for polynomial and sigmoid kernels and progam stops if only a single value is supplied. However, if the vector of values is supplied in the cases of RBF and liner kernels, only the first value will be used. Default is a vector value "c(2,1)".
...	Additional arguments for glmnet.

Value

Object of class ELMmboost with elements

elmcoxfit	A list of base ELMCox models of of size enlen.To retrieve a particular base model: use elmcoxfit[[i]], where i takes values between 1 and enlen
trainx	Training data covariates.
kerneltype	Type of kernel matrix used in training. kerneltype=1,a RBF kernel;kerneltype=2 , a linear kernel;kerneltype=3 ,a polynomial kernel;kerneltype=4, a sigmoid kernel.
Kernel_para	Parameters used in training. A single value for kerneltype=1 or 2. A vector for kerneltype=3 or 4.

Author(s)

Hong Wang

See Also

ELMCox

Examples

set.seed(123)
require(SurvELM)
require(survival)
#Lung DATA
data(lung)
lung=na.omit(lung)
lung[,3]=lung[,3]-1
n=dim(lung)[1]
L=sample(1:n,ceiling(n*0.5))
trset<-lung[L,]
teset<-lung[-L,]
rii=c(2,3)
# with ridge penalty and RBF kernel, alpha has the same meaning as in glmnet
elmsurvmodel=ELMCoxEN(x=trset[,-rii],y=Surv(trset[,rii[1]],trset[,rii[2]]),
enlen=10,Kernel_type="RBF_kernel",Kernel_para=c(2,1),alpha=0)
#The second base model
fit2=elmsurvmodel$elmcoxfit[[2]]
#The predicted linear predictor
testprelin=predict(elmsurvmodel,teset[,-c(rii)],type="link")
#The predicted  relative-risk
testpreres=predict(elmsurvmodel,teset[,-c(rii)],type="response")

whcsu/SurvELM documentation built on Jan. 28, 2020, 3:07 p.m.