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Table 4 Summary of API determination using a bootstrap approach (in a similar way to that documented in Shaar et al. 2011) for the IZZI-Thellier results

From: Paleomagnetic study of basaltic rocks from Baengnyeong Island, Korea: efficiency of the Tsunakawa–Shaw paleointensity determination on non-SD-bearing materials and implication for the early Pliocene geomagnetic field intensity

SpecimenNRM0 (Am2/kg)Blab (μT)θkBDSmInformation of specimen-level paleointensity estimatesBootstrap constraints of overall meana
BminBmax (μT)Bmax/Bmin 95% confidence interval (µT)Mean ± SD (µT)
B1A-1-27.92E–0415.0281.2430.4463.2–51.316N = 89.9–24.016.6 ± 3.6
B1B-1-21.05E–0315.0341.1670.4673.1–39.913N = 2 (Bmax/Bmin < 5)6.6–19.712.6 ± 3.5
B1B-2-29.53E–0415.0541.1910.4673.1–39.413
B1D-1-29.47E–0415.0991.1230.3334.0–41.810   
B1E-1-28.49E–0415.0701.1420.3333.8–38.110   
B1G-1-29.00E–0415.0501.1630.3463.3–39.912   
B2C-1-28.02E–0415.0840.7200.4034.9–20.74.2   
B2C-2-21.29E–0315.0430.9930.4035.6–25.14.5   
  1. NRM0, Blab, θ, and k are the same as in Table 3. BDSm, the associated mean value from the measurements of bulk domain stability (Paterson et al. 2017) by 4 subsamples for the drilled samples. Bmin, Bmax, the minimum and maximum of all of PI estimates that meet a loose set of selection criteria (n ≥ 4, f ≥ 0.3 and β ≤ 0.2; see Paterson et al. (2014) for definitions of the statistics) for each specimen
  2. aDescribes the information on an overall mean of API estimates obtained when running a re-sampling routine that randomly picks values from the Bmin to Bmax for each specimen and calculates a large number of their means (n = 10,000): N, the number of specimens used in the bootstrap procedure; S.D., the standard deviation of the 10,000 means. See “IZZI-Thellier (IZZI-T) determination” section for details