Statistical comparisons of preservational quality between ambers in different Table 3: chemical groups. The observed effect size is calculated from the proportions (p1 and p2) of fossils in each group that have preserved internal structures. The measurable effect size is based on a power analysis using the program R, which indicates what effect size can be accurately measured given the sample sizes. There is appropriate power for a statistical comparison if the measurable effect size is smaller than the observed effect size. The Fisher Exact tests were also carried out using the program R; significant p-values (p-values < 0.008, due to a Bonferroni correction for multiple tests) are in bold. Observed Measurable Appropriate effect size = effect size power for Fisher Exact Comparison (power statistical Test p-value analysis) comparison? Group A to Group C 0.963 0.789 yes 0.001 Group A to Group D 1.558 0.715 yes 1.86E-08 Group C to Group D 0.594 0.820 no NA Dominican amber to 1.020 0.898 yes 0.008 Baltic Amber Dominican amber to 1.020 1.134 no NA Chiapas amber Charentes to 3.142 2.069 yes 0.004 Lebanese amber Charentes to 0 1.216 no NA New Jersey amber Charentes amber to 1.918 1.724 no 0.010 Burmese amber Lebanese to 3.142 2.246 yes 0.028 New Jersey amber Lebanese amber to 1.224 2.557 no NA Burmese amber New Jersey amber to 1.918 1.933 no NA Burmese amber
Table 3: Statistical comparisons of preservational quality between ambers in different chemical groups. The observed effect size is calculated from the proportions (p1 and p2) of fossils in each group that have preserved internal structures. The measurable effect size is based on a power analysis using the program R, which indicates what effect size can be accurately measured given the sample sizes. There is appropriate power for a statistical comparison if the measurable effect size is smaller than the observed effect size. The Fisher Exact tests were also carried out using the program R; significant p-values (p-values < 0.008, due to a Bonferroni correction for multiple tests) are in bold. Comparison Observed effect size = Measurable effect size (power analysis) Appropriate power for statistical comparison? Fisher Exact Test p-value Group A to Group C 0.963 0.789 yes 0.001 Group A to Group D 1.558 0.715 yes 1.86E-08 Group C to Group D 0.594 0.820 no NA Dominican amber to Baltic Amber 1.020 0.898 yes 0.008 Dominican amber to Chiapas amber 1.020 1.134 no NA Charentes to Lebanese amber 3.142 2.069 yes 0.004 Charentes to New Jersey amber 0 1.216 no NA Charentes amber to Burmese amber 1.918 1.724 no 0.010 Lebanese to New Jersey amber 3.142 2.246 yes 0.028 Lebanese amber to Burmese amber 1.224 2.557 no NA New Jersey amber to Burmese amber 1.918 1.933 no NA