The isolation index, xPx, is an exposure index 
that measures the probability that two members of a group share 
the same spatial unit. This index can be calculated using the 
approximate or the exact method (see Bell, 1954).

A set of indexes and tests for the analysis of social segregation.

Mihai Tivadar

OasisR

Outright Tool for the Analysis of Spatial Inequalities and
Segregation

xPx function

<dl><dt>x</dt>
<dd>- an object of class matrix (or which can be coerced to that class), 
where each column represents the distribution of a group within 
spatial units. The number of columns should be greater than 1 (at least 2 
groups are required). You should not include a column with total 
population, because this will be interpreted as a group.</dd>
<dt>exact</dt>
<dd>- a logical variable to specifiy the index version: 
exact = FALSE (by default) for the approximate version of the index, 
and exact = TRUE for the exact version</dd></dl>

Arguments

A function to compute Bell's isolation index (xPx) — xPx

<dl>

<dt>x</dt>
<dd>- an object of class matrix (or which can be coerced to that class), 
where each column represents the distribution of a group within 
spatial units. The number of columns should be greater than 1 (at least 2 
groups are required). You should not include a column with total 
population, because this will be interpreted as a group.</dd>


<dt>exact</dt>
<dd>- a logical variable to specifiy the index version: 
exact = FALSE (by default) for the approximate version of the index, 
and exact = TRUE for the exact version</dd>

</dl>

xPx: A function to compute Bell's isolation index (xPx)

Description

Usage

Value

Arguments

References

See Also

Examples