Net Determination Bias Error (NDBE)
Dutch translation: nauwkeurigheid van de formule in positieve of negative percentages uitgedrukt
| 09:24 Mar 7, 2017 |
| English to Dutch translations [PRO] Science - Mathematics & Statistics | |||||||
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|  Selected response from: Arend H Bure (X) Germany Local time: 22:54 | ||||||
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| 3 | nauwkeurigheid van de formule in positieve of negative percentages uitgedrukt |
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| net determination bias error (ndbe) nauwkeurigheid van de formule in positieve of negative percentages uitgedrukt Explanation: Wat er staat :) |
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Reference comments
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| Reference: definition Reference information: Net Determination Bias Error (NDBE): The percentage error in energy use predicted by the model compared to actual energy use. https://saveonenergy.ca/Business/Program-Overviews/Multi-Sit... Moreover, to consider a model valid for retrofit savings analysis, the net determination bias error (NBE) should be less that 0.005% (ASHRAE Guideline 14, 2002). The NBE is defined as percentage difference of total energy consumed as predicted by the model and the energy used as determined from utility bills. The NBE mathematical definition can be seen in Equation 1-5 (ASHRAE Guideline 14, 2002). https://tinyurl.com/hcog6x4 -------------------------------------------------- Note added at 4 hrs (2017-03-07 13:38:39 GMT) -------------------------------------------------- To complete development of the model and check the bias, the modeled values for kWh per day are multiplied by the number of days in the billing period. And then, the net determination bias error (NBE) has been calculated as below: From ASHRAE Guideline, only a model with bias <0.005% is accepted, and the NBE of the current model is 0.0008%. That is, this proposed model is very acceptable so that it can be utilized to estimate the weather- dependent energy consumption in Sargent. https://www.osti.gov/scitech/servlets/purl/1336187/ -------------------------------------------------- Note added at 4 hrs (2017-03-07 13:56:16 GMT) -------------------------------------------------- Net Determination Bias Error (NBD or NBE): A statistical metric that quantifies the tendency of a model to underestimate or overestimate savings. Typically represented as a percentage. Note that if regression is performed property, net determination bias should be zero. When developing an energy model with irregular time intervals, time intervals must be accounted for in the regression analysis or the model will be biased. This is accomplished by first converting the data for each observation to an average value for the time interval. Then all dependent and independent variables need to be weighted by the number of intervals in the billing period. This can be accomplished by using weighted regression analysis, or duplicating each observation by the number of time intervals in the billing period. Table 5 shows that ordinary regression analysis results in a net determination bias (NDB) of more than the acceptable cut-off criterion given in ASHRAE Guideline 14 of 0.005%. The weighted regression provides a net bias error that meets this criterion and could be improved by using more precise estimates of the coefficients. https://www.bpa.gov/ee/policy/imanual/documents/july documen... |
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