DSI: Calculate the Disease Severity Index (DSI) (class for each...

In r4pde: Companion to R for Plant Disease Epidemiology Book

Calculate the Disease Severity Index (DSI) (class for each unit)

Description

This function calculates the Disease Severity Index (DSI) based on the provided unit, class, and maximum class value. The DSI is computed by aggregating the classes, calculating weights by multiplying the frequency of each class by the class itself, and then dividing the sum of these weights by the product of the total number of entries and the maximum class value, then multiplying by 100.

Usage

DSI(unit, class, max)

Arguments

unit	A vector representing the units.
class	A vector representing the classes corresponding to the units.
max	A numeric value representing the maximum possible class value.

Value

Returns a single numeric value representing the DSI.

See Also

Other Disease quantification: CompMuCens(), DSI2()

Examples

# Example usage:
unit <- c(1, 2, 3, 4, 5, 6)
class <- c(1, 2, 1, 2, 3, 1)
max <- 3
DSI(unit, class, max)

r4pde documentation built on July 2, 2025, 5:09 p.m.