Table 2 Statistical analysis of the repeated measurements of the different chronologies.
From: Tree-rings reveal two strong solar proton events in 7176 and 5259 BCE
χ2 | Deg. of freedom | P(χ2>) value | |
|---|---|---|---|
All (7176 BCE) | 255.3 | 202 | 0.01 |
Alpine Larch (7176 BCE) | 6.3 | 6 | 0.39 |
German Oak (7176 BCE) | 112.6 | 93 | 0.08 |
Bristlecone Pine (7176 BCE) | 12.4 | 13 | 0.50 |
All (5259 BCE) | 254.0 | 216 | 0.04 |
Irish Oak (5259 BCE) | 89.0 | 82 | 0.28 |
Alpine Larch(5259 BCE) | 15.9 | 13 | 0.25 |
Siberian Larch (5259 BCE) | 10.2 | 24 | 0.99 |
Bristlecone Pine (5259 BCE) | 16.6 | 24 | 0.87 |
