Delphi CAG JSON format

The JSON file has the following fields:

• name: The name of the model
• dateCreated: Model creation date.
• variables: List of CAG variables/nodes. Each variable has the following properties:
  • name: Name of the variable
  • units: Units of the variable (just a placeholder for now)
  • dtype: Datatype (all variables are real-valued right now, boolean/categorical to come later)
  • arguments: CAG nodes that have an edge pointing from them to the variable.
  • indicators: List of indicators for the abstract concepts represented by the variables. Each indicator has the following properties:
    • name: The name of the indicator
    • dataset: Deprecated field, to be removed later.
    • source: Source of the indicator (FAO/WDI or CYCLES)
    • unit: Units of the indicator
    • mean: Mean value of the indicator
    • stdev: Standard deviation of the indicator
    • time: Time (caveat: accurate only up to a yearly resolution for now) that the mean value corresponds to.
• timestep: Timestep of the model (set to 1.0 by default for now)
• edge_data: List of edges with their data. Each edge has the following properties:
  • source: The source of the edge.
  • target: The target of the edge.
  • CPT: The conditional probability table corresponding to a histogram of the values of $\theta$ (See this writeup for more details.). The CPT has two fields:
    • theta: List of left bin edges for the theta histogram.
    • P(theta): The height of the bin, proportional to the value of the probability distribution function of theta at this point.
  • polyfit: A least-squares polynomial fit to the probability distribution function of theta (requested by SRI for use with the PRAiSE-WM systems). polyfit has the following properties:
    • degree: The degree of the polynomial that is fit (default = 7)
    • coefficients: A list of real-valued coefficients of the polynomial fit, ordered from low to high.
  • InfluenceStatements: A list of INDRA statements that correspond to the edge, serialized in JSON form (see here for more details. The InfluenceStatements contain the provenance information.