Non-household night use assessment - methodology development
Non-household night use is a key component in the calculation of DMA leakage. Since 2011 CMWE has been collaborating with Dwr Cymru/Welsh Water to improve and refine the existing methodology for assessing non-household night use, and to implement the results of the research to refine DCWW's night use allowance assessments. The research includes:
Non-household night use is a key component in the calculation of DMA leakage. Since 2011 CMWE has been collaborating with Dwr Cymru/Welsh Water to improve and refine the existing methodology for assessing non-household night use, and to implement the results of the research to refine DCWW's night use allowance assessments. The research includes:
- identification and quantification of the re-transformation bias that arises in the existing UKWIR best practice methodology
- identification and implementation of appropriate bias correction methodologies including the use of smearing estimators
- exploration of alternative and more robust modelling approaches for assessing night use which not only eliminate the problem of re-transformation bias but also deal more effectively with 'inactive' night use (censorship), including tobit, generalised linear models and two-stage models
- improved methods for dealing with outliers, notably Cook's Distance
- methods for achieving a more efficient stratification of the non-household meter population
Reports and presentations by CMWE on non-household night use assessment methodology developments
Manning, C. (2017). Non-Household Night Use Assessment: Re-transformation Bias. Research Note. CM Water Economics Ltd, April 2017
Manning, C. (2017). Non-household Night Use Assessment. Presentation to UK Water Industry Leakage Managers Group, Nuneaton, UK. CM Water Economics Ltd, June 2017
Manning, C. (2017). Non-Household Night Use Assessment: Re-transformation Bias. Research Note. CM Water Economics Ltd, April 2017
Manning, C. (2017). Non-household Night Use Assessment. Presentation to UK Water Industry Leakage Managers Group, Nuneaton, UK. CM Water Economics Ltd, June 2017
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Copyright © 2017 Caroline Manning, CM Water Economics Ltd. The ideas and material presented are not to be used without the permission of CM Water Economics Ltd