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. 2014 Oct 25;12:130. doi: 10.1186/s40201-014-0130-6

Table 2.

Model parameters

Model Regression function Nugget, (C o ) Range, A Sill, (C o  + C) Nugget/Sill, (%) ME 1 RMSSE 2
226Ra Exponential 0.2695 x +18.32 48.35 254369.7 186.83 25.88 0.004 1.06
232Th Exponential 0.5063 x +15.33 50.74 304696.1 300.03 16.91 0.008 0.89
40 K Stable 0.1596 x +381.99 41767.52 375276.0 59158.77 70.60 0.007 0.997

ME1: mean standard error.

RMSSE2: estimated standardized mean of error of mean square root.