Table 1.

Index formulae and judgment criteria for spatial distribution patterns.

Name	Formula	Aggregation Distribution	Random Distribution	Uniform Distribution
C	$C={\sigma }^2/m$	>1	=1	<1
m*	$m^{*}=m+{\sigma }^2/m-1$	>m	=m	<m
I	$I=n\times \frac{\left(\sum m^2-\sum m\right)}{\left[{\left(\sum m\right)}^2-\sum m\right]}$	>1	=1	<1

$\mathrm{A}\mathrm{n}\mathrm{n}\mathrm{o}\mathrm{t}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}:{\sigma }^2=$ variance, m = mean and n = the total number of host samples.