Ecole Nationale Supérieure Agronomique de Montpellier ... - CIAM

Fig. 3. Bilateral permutation test (α = 5%) of independence between initial and later
infections on a lattice. The points represent the observed values of the distance-based test
statistic, and gray levels indicate the corresponding P-values. The dotted lines are the mean
values of the criteria and the dashed lines correspond to the upper and lower 2.5% thresholds
for each distance class under the hypothesis of independence. A, Trend toward aggregation
within row between the two groups of plants infected by the European stone fruit yellows
(confidence intervals are based on 1,000 random permutations; Test 1, see text). B,
Significant aggregation between newly diseased plants and previously diseased plants in the
orchard infected by Plum pox virus (confidence intervals are based on 663 toroidal shifts; Test
3, see text).
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