Diachronic Change within the Still Bay at Blombos Cave, South Africa.

In the multiple regression investigating the interaction between size and stratigraphic layer, the full-reduced model comparison indicated that the interaction was very close to being significant (F = 3.578, P = 0.06) ( Table 4 ).

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For many statisticians, a “marginally non-significant p-value” indicates some evidence against the null-hypothesis [ 93 , 110 ].

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There may be significant interactions between individual drivers of bifacial point shape, and these interactions can only be tested for by formulating models for this purpose.

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