A Statistical Analysis of Ringfort Distribution and Morphology on the ...

early Christian date
Fig. 5.22 Line-graph showing the variations in returned r values from nearest
neighbour analysis over a number <strong>of</strong> site types <strong>and</strong> the various recalibrations to
the data
Fig. 5.23 Results <strong>of</strong> regular nearest neighbour analysis in comparison with
experimental analysis, allowing for slope
Fig. 5.24 Tabulated data <strong>of</strong> observed vs. Expected frequencies <strong>of</strong> ringforts in
relation to soil types
Fig. 5.25 Tabulated results <strong>of</strong> chi - square test with Yates’ continuity correction
on normal <strong>and</strong> combined categories <strong>of</strong> soil types
Fig. 5.26 Observed vs. Expected frequencies <strong>of</strong> ringforts re-categorised by
great soil group
Fig. 5.27 Tabulated results <strong>of</strong> chi - square test <strong>and</strong> Yates continuity correction
on great soil groups
Fig. 5.28 Histogram <strong>of</strong> observed vs. Expected occurrences <strong>of</strong> ringforts on the
various great soil groups
Fig. 5.29 Tabulated results <strong>of</strong> chi - square test <strong>and</strong> with Yates’ continuity
correction for related earthwork sites
Fig. 5.30 Histogram <strong>of</strong> observed vs. Expected occurrences <strong>of</strong> ringforts <strong>and</strong>
related sites on the various great soil groups
Fig. 5.31 Revised histogram <strong>of</strong> observed vs. Expected occurrences <strong>of</strong> ringforts
on the various great soil groups, re-categorised to indicate site location within
0.5km <strong>of</strong> brown earths <strong>and</strong> brown podzolics
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105
Fig. 6.1 Variables used in the cluster analysis procedure 110
Fig. 6.2 Dendrogram <strong>of</strong> the last five cycles <strong>of</strong> ‘Ward’s Method’ for cluster
111
analysis
Fig. 6.3 Cluster I: F-ratios <strong>and</strong> T-values 112
Fig. 6.4 Cluster I Soils 112
Fig. 6.5 Cluster II: F-ratios <strong>and</strong> T-values. 113
Fig. 6.6 Cluster II Soils. 114
Fig. 6.7 Cluster III: F-ratios <strong>and</strong> T-values 114
Fig. 6.8 Cluster III Soils 116
Fig. 6.9 Cluster IV: F-ratios <strong>and</strong> T-values 117
Fig. 6.10 Cluster IV Soils 117
Fig. 6.11 Cluster V: F-ratios <strong>and</strong> T-values 118
Fig. 6.12 Cluster V Soils 119
Fig. 6.13 PCA scattergram for Loop Head area ringforts 122
Fig. 6.14 PCA scattergram <strong>of</strong> variable distribution for ringforts 123
Fig. 6.15 Comparisons between maximum <strong>and</strong> minimum Eigenvalues for
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Clusters I - V over 1st <strong>and</strong> 2nd Principal Components
Fig. 6.16 Ranges <strong>of</strong> values <strong>of</strong> 1st principal component for Clusters I-V 125
Fig. 6.17 Ranges <strong>of</strong> values <strong>of</strong> 2nd principal component for Clusters I-V 125
Fig. 6.18 Principal components analysis scattergram for Loop Head area
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ringforts, re-coded by cluster membership
Fig. 6.19 Enlarged section <strong>of</strong> centroid area <strong>of</strong> principal components analysis
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scattergram for Loop Head area ringforts, re-coded by cluster membership
Fig. 7.1 L<strong>and</strong> values from Early Irish law 135
Fig. 7.2 Tabulation <strong>of</strong> cluster groupings with postulated grade from the Early
158
Irish laws
Fig. 7.3 Normative model <strong>of</strong> ringfort distribution for the Loop Head peninsula 160
Fig. 7.4 Hypothetical model <strong>of</strong> ringfort distribution for the Loop Head peninsula 161
Fig. Gaz. 1 Plan <strong>and</strong> section <strong>of</strong> Liscroneen ringfort (32) 185
Fig. Gaz. 2 Plans <strong>and</strong> sections <strong>of</strong> Lismaguine (65) <strong>and</strong> Lisheencrony (66)
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ringforts
x