DSI2

This function calculates the Disease Severity Index (DSI) given a vector of classes,
a vector of frequencies, and a maximum possible class value. The DSI is calculated
as a weighted sum of class values, where each class is multiplied by its corresponding
frequency, then divided by the product of the total frequency and maximum class value,
and finally multiplied by 100 to get a percentage.

Datasets and utility functions to support the book
"R for Plant Disease Epidemiology" (R4PDE). It includes functions for quantifying disease,
assessing spatial patterns, and modeling plant disease epidemics based on weather predictors.
These tools are intended for teaching and research in plant disease epidemiology. Several functions
are based on classical and contemporary methods, including those discussed in Laurence V. Madden,
Gareth Hughes, and Frank van den Bosch (2007) <doi:10.1094/9780890545058>.

Emerson M. Del Ponte

r4pde

Companion to R for Plant Disease Epidemiology Book

Emerson Del Ponte

DSI2 function

<dl><dt>class</dt>
<dd>A numeric vector representing the classes.</dd>
<dt>freq</dt>
<dd>A numeric vector representing the frequency of each class.
Must be the same length as 'class'.</dd>
<dt>max</dt>
<dd>A numeric value representing the maximum possible class value.</dd></dl>

Arguments

Calculate the Disease severity Index (DSI) (frequency of each class) — DSI2

<dl>

<dt>class</dt>
<dd>A numeric vector representing the classes.</dd>


<dt>freq</dt>
<dd>A numeric vector representing the frequency of each class.
Must be the same length as 'class'.</dd>


<dt>max</dt>
<dd>A numeric value representing the maximum possible class value.</dd>

</dl>

DSI2: Calculate the Disease severity Index (DSI) (frequency of each class)

Description

Usage

Value

Arguments

See Also

Examples