Network analysis — topology versus measurement

Separate a true conceptual network from the graph observed through a sampling process. Missing nodes and edges alter centrality and communities; layout proximity is not a measured relationship.

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{
  "nodes": [
    { "id": "concept", "type": "rounded", "label": "Defined node and edge semantics", "x": 40, "y": 200, "width": 150, "height": 104, "fill": "#ede9fe", "stroke": "#6d28d9" },
    { "id": "sample", "type": "rounded", "label": "Network observation process", "x": 215, "y": 200, "width": 150, "height": 104, "fill": "#fef3c7", "stroke": "#b45309" },
    { "id": "graph", "type": "card", "label": "Observed directed / weighted graph", "x": 390, "y": 200, "width": 150, "height": 104, "fill": "#ccfbf1", "stroke": "#0f766e" },
    { "id": "miss", "type": "octagon", "label": "Missingness and threshold choices", "x": 390, "y": 520, "width": 150, "height": 104, "fill": "#e0f2fe", "stroke": "#0369a1" },
    { "id": "cent", "type": "rounded", "label": "Centrality analysis", "x": 565, "y": 40, "width": 150, "height": 104, "fill": "#fef3c7", "stroke": "#b45309" },
    { "id": "comm", "type": "rounded", "label": "Community analysis", "x": 565, "y": 360, "width": 150, "height": 104, "fill": "#fef3c7", "stroke": "#b45309" },
    { "id": "null", "type": "octagon", "label": "Null / sensitivity comparison", "x": 740, "y": 200, "width": 150, "height": 104, "fill": "#e0f2fe", "stroke": "#0369a1" },
    { "id": "interp", "type": "rounded", "label": "Meaning under sampling assumptions", "x": 915, "y": 200, "width": 150, "height": 104, "fill": "#fce7f3", "stroke": "#be185d" }
  ],
  "edges": [
    { "id": "e0", "source": "concept", "target": "sample", "label": "operationalise" },
    { "id": "e1", "source": "sample", "target": "graph", "label": "observe" },
    { "id": "e2", "source": "miss", "target": "graph", "label": "document", "style": "dashed" },
    { "id": "e3", "source": "graph", "target": "cent", "label": "summarise roles" },
    { "id": "e4", "source": "graph", "target": "comm", "label": "summarise structure" },
    { "id": "e5", "source": "cent", "target": "null", "label": "compare" },
    { "id": "e6", "source": "comm", "target": "null", "label": "compare" },
    { "id": "e7", "source": "null", "target": "interp", "label": "avoid layout-based claims" }
  ]
}