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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
  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