baseRandForest: Prediction by random forest

In BioMM: BioMM: Biological-informed Multi-stage Machine learning framework for phenotype prediction using omics data

Description

Prediction by random forest with different settings: 'probability', 'classification' and 'regression'.

Usage

baseRandForest(
  trainData,
  testData,
  predMode = c("classification", "probability", "regression"),
  paramlist = list(ntree = 2000, nthreads = 20)
)

Arguments

trainData	The input training dataset. The first column is the label or the output. For binary classes, 0 and 1 are used to indicate the class member.
testData	The input test dataset. The first column is the label or the output. For binary classes, 0 and 1 are used to indicate the class member.
predMode	The prediction mode. Available options are c('probability', 'classification', 'regression').
paramlist	A set of model parameters defined in an R list object. The valid option: list(ntree, nthreads). 'ntree' is the number of trees used. The defaul is 2000. 'nthreads' is the number of threads used for computation. The default is 20.

Value

The predicted output for the test data.

Author(s)

Junfang Chen

Examples

 
## Load data  
methylfile <- system.file('extdata', 'methylData.rds', package='BioMM')  
methylData <- readRDS(methylfile)  
dataY <- methylData[,1]
## test a subset of genome-wide methylation data at random
methylSub <- data.frame(label=dataY, methylData[,c(2:2001)])  
trainIndex <- sample(nrow(methylSub), 12)
trainData = methylSub[trainIndex,]
testData = methylSub[-trainIndex,]
library(ranger)
predY <- baseRandForest(trainData, testData, 
                        predMode='classification', 
                        paramlist=list(ntree=300, nthreads=20)) 
testY <- testData[,1]
accuracy <- classifiACC(dataY=testY, predY=predY)
print(accuracy) 

BioMM documentation built on Nov. 8, 2020, 11:04 p.m.