RTextTools (version 1.3.2)

create_ensembleSummary: creates a summary with ensemble coverage and precision.

Description

Creates a summary with ensemble coverage and precision values for an ensemble greater than the threshold specified.

Usage

create_ensembleSummary(document_summary, threshold)

Arguments

document_summary

The document_summary slot from the analytics_container-class generated by create_analytics.

threshold

The number of algorithms greater than or equal to this threshold that agree on the same topic. For example, a threshold value of 3 will search for those documents where 3 or more algorithms agreed.

Details

This summary is created in the create_analytics function. Note that a threshold value of 3 will return ensemble coverage and precision statistics for topic codes that had 3 or more (i.e. >=3) algorithms agree on the same topic code.

Examples

library(RTextTools)
data <- read_data(system.file("data/NYTimes.csv.gz",package="RTextTools"),type="csv")
data <- data[sample(1:3100,size=100,replace=FALSE),]
matrix <- create_matrix(cbind(data$Title,data$Subject), language="english", 
removeNumbers=TRUE, stemWords=FALSE, weighting=weightTfIdf)
corpus <- create_corpus(matrix,data$Topic.Code,trainSize=1:75, testSize=76:100, 
virgin=FALSE)
models <- train_models(corpus, algorithms=c("MAXENT","SVM"))
results <- classify_models(corpus, models)
analytics <- create_analytics(corpus, results)
ensemble <- create_ensembleSummary(analytics@document_summary,2)
ensemble