Abstract
Forecast DNI values in hourly resolution for one day ahead are evaluated by a comparison with pyrheliometer ground measurements. Three months of such day ahead forecasts from four different providers for a site close to Questa, NM, USA are analyzed firstly by calculating the RMSE and the mean bias error. Secondly, cumulative distributions of the DNI forecast errors are calculated as they better suit the context of a utility's use of the forecast. © 2012 American Institute of Physics.
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Gerstmaier, T., Buḧrer, M., Roẗtger, M., Gombert, A., Hansen, C. W., & Stein, J. S. (2012). How predictable is DNI? An evaluation of day ahead DNI forecasts from four different providers. In AIP Conference Proceedings (Vol. 1477, pp. 305–308). https://doi.org/10.1063/1.4753892
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