mcca (version 0.7.0)

plot.mcca.hum: Plot 3D ROC surface

Description

plot the 3D ROC surface for a three-category classifier using the 3-dimensional point coordinates, computed by obj which is a mcca.hum class.

Usage

# S3 method for mcca.hum
plot(x,labs=levels(x$y),coords=1:3,nticks=5,filename='fig.png',cex=0.7, …)

Arguments

x

An mcca.hum class object, containing probability matrix and labels.

labs

The label names of three coordinates. Default is `levels(x$y)`.

coords

The coordinates markers. Default is `c(1,2,3)`, which means labs[1] is the x-axis (class 1), labs[2] is the z-axis (class 3) and labs[3] is the y-axis (class 2).

nticks

Suggested number of ticks.

filename

Filename to save snapshot.

cex

Size for text.

…

further arguments to `plot.default`.

Value

The function doesn't return any value.

Details

This function is to plot the 3D ROC surface according to the correct classification probabilities for the three categories, resulted from any statistical or machine learning methods. This function complements the HUM package which can only plot 3D ROC surface for a single diagnostic test or biomarker for three classes.

References

Li, J., and Zhou, X. H. (2009). Nonparametric and semiparametric estimation of the three way receiver operating characteristic surface. Journal of Statistical Planning and Inference. 139: 4133<U+2014>4142.

Li, J., Gao, M., D<U+2019>Agostino, R. (2019). Evaluating Classification Accuracy for Modern Learning Approaches. Statistics in Medicine (Tutorials in Biostatistics). 38(13): 2477-2503.

Examples

# NOT RUN {
data <- iris[, 1]
label <- iris[, 5]
a=hum(y = label, d = data,method = "multinom")
#plot(a,filename='fig.png')

# }