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Percent difference (DIFF%)
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\(DIFF\% = \left[ {\left( {\frac{{BHT_{CALC\left( i \right)} - BHT_{m\left( i \right)} }}{{BHT_{m\left( i \right)} }}} \right) \times 100} \right]\)
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(6)
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García-López et al. (2014)
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Root mean square error (RMSE)
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\(RMSE = \sqrt{{\frac{1}{n}\mathop \sum \limits_{i = 1}^{n} \left( {BHT_{m\left( i \right)} - BHT_{CALC\left( i \right)} } \right)^{2} }}\)
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(7)
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Willmott et al. (2009)
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Mean absolute error (MAE)
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\(MAE = \frac{1}{n}\mathop \sum \limits_{i = 1}^{n} \left| {BHT_{m\left( i \right)} - BHT_{CALC\left( i \right)} } \right|\)
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(8)
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Wang and Lu (2018)
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Mean absolute percentage error (MAPE)
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\(MAPE = \left( {\frac{1}{n}\mathop \sum \limits_{i = 1}^{n} \left| {\frac{{BHT_{m\left( i \right)} - BHT_{CALC\left( i \right)} }}{{BHT_{m\left( i \right)} }}} \right|} \right) \times 100\)
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(9)
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Li and Shi (2010)
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Difference coefficient (Theil's U)
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\(Theil^{\prime}s U = \frac{{\sqrt{{\mathop \sum \nolimits_{i = 1}^{n} \left( {BHT_{m\left( i \right) - } BHT_{GaS\_GeoT\left( i \right) } } \right)^{2} }}}}{{\sqrt{{\mathop \sum \nolimits_{i = 1}^{n} \left( {BHT_{m\left( i \right) - } BHT_{GasGeo\_Lit\left( i \right) } } \right)^{2} }}}}\)
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(10)
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Álvarez del Castillo et al. (2012)
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