Table 3 |
||||
|
R index, standard error of expected mean, s, and z statistic [13] for the data sets used. When the pattern is entirely random R = 1, if the events are uniform then R > 1 (R = 2.149 for a perfect hexagonal uniform distribution) and conversely when the population of events is clumped R < 1 (R approaches 0 for maximally clumped distribution). The z test statistic considers the null hypothesis that the spatial distribution is random. Data sets comparable to those generated in [1] in italics. |
||||
|
Dataset |
R |
s |
z |
Pattern |
|
|
||||
|
Hexagonal |
2.15 |
0.003 |
76.53 |
Uniform |
|
Rice 3 |
1.41 |
0.002 |
39.57 |
Uniform |
|
PG 92 |
1.36 |
0.067 |
6.16 |
Uniform |
|
Bee-eater |
1.34 |
0.086 |
8.17 |
Uniform |
|
PG 93 |
1.3 |
0.077 |
4.9 |
Uniform |
|
Uniform |
1.25 |
0.003 |
17.34 |
Uniform |
|
Rice 1 |
1.08 |
0.004 |
6.12 |
Uniform |
|
Rice 5 |
1.04 |
0.016 |
0.99 |
Random |
|
Poisson |
0.98 |
0.003 |
-1.1 |
Random |
|
Rice 4 |
0.94 |
0.013 |
-1.59 |
Random |
|
Xanth |
0.89 |
0.017 |
-4.3 |
Clumped |
|
Corn 1 |
0.88 |
0.014 |
-8.69 |
Clumped |
|
Rice 2 |
0.88 |
0.019 |
-2.43 |
Clumped |
|
Sugar 1 |
0.83 |
0.002 |
-8.15 |
Clumped |
|
Clump 1 |
0.8 |
0.003 |
-14.79 |
Clumped |
|
Clump 2 |
0.8 |
0.002 |
-16.34 |
Clumped |
|
Sugar 3 |
0.76 |
0.003 |
-9.45 |
Clumped |
|
Corn 2 |
0.75 |
0.039 |
-11.12 |
Clumped |
|
Sugar 4 |
0.7 |
0.011 |
-6.57 |
Clumped |
|
Waterfowl |
0.65 |
0.007 |
-12.6 |
Clumped |
|
Sugar 2 |
0.64 |
0.013 |
-7.32 |
Clumped |
|
Corn 3 |
0.47 |
0.043 |
-21.97 |
Clumped |
|
|
||||
|
White et al. BMC Ecology 2008 8:6 doi:10.1186/1472-6785-8-6 |
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