Plot Receiver Operating Characteristic (ROC) curve for metabolites with or without covariates

## Usage

plot_ROC(
object = NULL,
y = NULL,
x = NULL,
model_a = NULL,
model_b = NULL,
lab = NULL,
text_x = 0.6,
text_y = 0.3
)

## Arguments

object

A Metabolite object.

y

A column name for the disease (0, 1)

x

One variable name (if x is provided, model_a and model_b should be NULL or vice versa).

model_a

Column names for model a (one or more covariates, as the first model).

model_b

Column names for model b (one or more covariates, as the second model).

lab

Title (eg. "BIOCHEMICAL"), default value is x.

text_x

Annotation position of text in x-axis.

text_y

Annotation position of text in y-axis.

ROC.