(d,e) The graphs for GHG emission show data harmonised for lifetime and annual yield and degradation (right) as described in the Methods section.
They are very widely used, but often stem from local initiatives, and they are seldom managed at national level (unlike, for example, the North-American Commodity Flow Survey, which is a shipper-based survey; or the European national road freight surveys, which are carrier based, with methodologies and data harmonised by Eurostat [12, 13]).
Although all data were harmonised based on consented harmonisation rules, the data from the different cohort studies are still not perfectly comparable owing to differences in study design and data collection procedures, and to inconsistencies in definitions of variables.
Thematic Layer: The available data is harmonised and classified into specific thematic areas e.g. Crime & Safety class, 'Bristol' locality, temporal validity of 2001-2012 arexampleses of expected classification parameters.
Data were harmonised, analysed separately employing Cox proportional hazard regression models, and combined by meta-analysis.
Meta-analyses, however, only incorporate the ORs and 95% CIs of published studies; they do not reanalyse the data to harmonise the comparison groups or standardise the model adjustments.
For future years, to help reduce heterogeneity between sites, we plan a common standard operating procedure and meetings at the beginning of the study to share pilot data and harmonise criteria and follow-up activities.
31 32 Methods used for collecting and harmonising data, and for handling missing data are detailed in the appendix (see online supplementary appendices 2 4).
Harmonised data collection coordinated through Eurostat facilitates this process (OECD and Eurostat, 2005).
It is a step up from Britain's existing laws and is designed to harmonise data privacy legislation within Europe.
