Reporting of Irradiance Model Relative Errors

Metrics used in assessing irradiance model accuracy such as Root Mean Square Error (RMSE) and Mean Absolute Error (MAE) are precisely defined. Their relative (%) counterpart, however, can be subject to interpretation and may cover a wide range of values for a given set of data depending on reporting practice. This article evaluates different approaches for the reporting of relative dispersion accuracy of a model and formulates recommendations for the most appropriate approach.

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