In all datasets combined, results were as follows ( Fig 14b ): Combined Stage 2 JTI = 1.81 + 0.38 * z − PC 1 (.06) (.06) Combined Stage 3 JTI = 1.59 + 0.22 * z − PC 1 (.05) (.05) Combined Stage 4 JTI = 1.24 + 0.07 * z − PC 1 (.03) (.04) Difference in Stage-2 and -3 slopes approached but did not reach significance (t = 1.75, p = .08) but Stage-3 and -4 slopes differed significantly (t = 2.25, p = .03).
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Stage and continuum approaches in prehistoric biface production: A North American perspective.
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Excluding Callahan data, the only near-significant differences in JTI slope upon z-PC1 were between Adams Stage 2 and its Stage 3 ( Table 8 ).