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Joint Research Center (JRC)
TRI-STOCK-CHARGER

Trinomics stock model for chargers of mobile phones and other small devices

Οtheremissionssmartphoneschargerscablesexternal power supplyESPUSBlightningstock

Quality & Transparency

Quality

Model uncertainties

Models are by definition affected by uncertainties (in input data, input parameters, scenario definitions, etc.). Have the model uncertainties been quantified? Are uncertainties accounted for in your simulations?

no
Key variables are the main source of uncertainty. These have been sensitivity tested (see below). Scenario definition for charger disposal (10% of stock per year) is a further key assumption. The model outputs based on these assumptions are validated by consumer survey responses.

    Sensitivity analysis

    Sensitivity analysis helps identifying the uncertain inputs mostly responsible for the uncertainty in the model responses. Has the model undergone sensitivity analysis?

    yes
    Key variables (e.g. charger profiles, sales) have been sensitivity checked.

      Have model results been published in peer-reviewed articles?

      no
      The model is not peer reviewed. Internal quality assurance is in place.

        Has the model formally undergone scientific review by a panel of international experts?

        Please note that this does not refer to the cases when model results were validated by stakeholders.

        no

          Model validation

          Has model validation been done? Have model predictions been confronted with observed data (ex-post)?

          no
          Current stock size is validated with consumer survey data. For the other outputs this is not possible, as not enough time has elapsed.

            Transparency

            To what extent do input data come from publicly available sources?

            This may include sources accessible upon subscription and/or payment

            Based on both publicly available and restricted-access sources

            Is the full model database as such available to external users?

            Whether or not it implies a specific procedure or a fee

            no
            Processed data is public, but some key input data on mobile phone sales and their split by manufacturer/model type is confidential commercial data purchased for the purpose of the analysis. This is included only in aggregate form in the model.

              Have model results been presented in publicly available reports?

              Note this excludes IA reports.

              yes

              Have output datasets been made publicly available?

              Note this could also imply a specific procedure or a fee.

              no
              Model outputs are made publicly available in IA reports. Outputs can be made available in agreement with DG GROW.

                Is there any user friendly interface presenting model results that is accessible to the public?

                For instance: Dashboard, interactive interfaces...

                no

                  Has the model been documented in a publicly available dedicated report or a manual?

                  Note this excludes IA reports.

                  no
                  No public documentation of the model is available. However, its elements are explained within the model and in the Annexes to the IA report.

                  Is there a dedicated public website where information about the model is provided?

                  no

                    Is the model code open-source?

                    no

                    Can the code be accessed upon request?

                    yes