{
  "version": "xarts.series-diagnostics/1",
  "family": "series-diagnostics",
  "provenance": {
    "legacyId": "periodogram"
  },
  "document": {
    "header": {
      "title": "No hay un cierre al año: hay cuatro",
      "subtitle": "Reparto de la varianza de los contratos firmados, 2018-2025, por duración del ciclo"
    },
    "footer": {
      "source": "Contratos firmados mes a mes, enero 2018 – diciembre 2025 (n = 96) — cifras ilustrativas",
      "notes": "Periodograma crudo: cada raya es el trozo de la varianza mensual que se lleva un ciclo de esa duración, y las rayas suman el 100 %. Antes de transformar se quitan la media y la recta de mínimos cuadrados (la deriva de fondo, +0,38 contratos al mes, no es un ciclo). El filete es el umbral de Fisher al 95 %: el nivel que la raya más alta de una serie sin estructura superaría sólo cinco veces de cada cien.",
      "alt": "Dos rayas se salen del umbral y el resto es hierba. El ciclo de doce meses —el cierre de año del que habla todo el mundo— se lleva el 40,7 % de la varianza, y el de tres meses el 34,3 %: tres cuartas partes de la oscilación entre los dos. El siguiente periodo, de 6,4 meses, se queda en el 2,1 %."
    },
    "spacing": {
      "horizontalPadding": 24,
      "topPadding": 22,
      "bottomPadding": 24,
      "minimumTextGap": 6
    }
  },
  "presentation": {
    "theme": "anlak",
    "dimensions": {
      "width": 940,
      "height": 540
    },
    "locale": "es-ES",
    "fonts": "reference",
    "surface": "theme",
    "framePadding": 24
  },
  "output": {
    "filename": "periodogram",
    "embedSpec": true,
    "geometryDecimals": 2
  },
  "operation": "spectrum",
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        "label": "mar 2018",
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        "label": "sep 2018",
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        "id": "month-93",
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      },
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        "id": "month-95",
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    ]
  },
  "sampling": {
    "spacing": "declared-regular",
    "step": 1,
    "unit": "meses"
  },
  "calculation": {
    "analysis": "periodogram",
    "detrend": "linear",
    "normalization": "variance-share",
    "taper": "none",
    "smoothing": "none",
    "zeroFrequency": "omit",
    "nyquist": "include",
    "minFrequencies": 12,
    "maxObservations": 2000,
    "reference": {
      "method": "fisher-first-term",
      "level": 0.95,
      "interpretation": "approximate-reference"
    }
  },
  "layout": {
    "view": "spectrum-bars-and-threshold",
    "coordinateLabels": "period",
    "frequencyUnit": "cycles-per-observation",
    "margin": {
      "top": 24,
      "right": 20,
      "bottom": 56,
      "left": 48
    },
    "domainPaddingFraction": 0.1,
    "axisInkPadding": 0,
    "axisMeasurementNumerals": "proportional-nums",
    "yTicks": 5,
    "xMaximumTicks": 8,
    "frequencyTickSuggestions": 8,
    "periodPriority": [
      2,
      3,
      4,
      12,
      6,
      7,
      24,
      13,
      52,
      26,
      30,
      60,
      365,
      5,
      10,
      20,
      8,
      15,
      40,
      50,
      90,
      100,
      120,
      180,
      250,
      500,
      1000
    ],
    "minimumExactPeriods": 3,
    "minimumStepWidth": 1,
    "tickLabelGap": 12,
    "peakLabelGap": 6,
    "noteGap": 16,
    "noteOffset": 8,
    "axisTitleExtraPadding": 6
  },
  "marks": {
    "bars": {
      "significant": "series.blue",
      "inside": "#7a9aa7",
      "widthFraction": 0.35,
      "maximumWidth": 8,
      "inactiveOpacity": 0.45
    },
    "threshold": {
      "color": "textMuted",
      "width": 1,
      "dash": "4 3"
    }
  },
  "labels": {
    "peaks": 3,
    "fontSize": 10,
    "noteFontSize": 11,
    "noteColor": "textMuted",
    "peakColor": "textPrimary",
    "peakOffset": 5,
    "shareDecimals": 1,
    "axisDecimals": 0,
    "periodDecimals": 1,
    "frequencyDecimals": 2,
    "detrend": {
      "mean": "sin la media",
      "linear": "sin media ni tendencia"
    },
    "explanation": {
      "mean": "Sólo se ha centrado la serie. Si tiene deriva, la deriva se reparte entre las frecuencias más bajas y se disfraza de ciclo del largo del registro.",
      "linear": "Se ha quitado la media y la recta de mínimos cuadrados. Una deriva no es un ciclo, y dejarla dentro carga las frecuencias más bajas con algo que no se repite."
    },
    "thresholdNote": "umbral de Fisher al {confidence} · {threshold}",
    "seriesNote": "«{series}» · {n} observaciones · {detrend}",
    "spanNote": " · {first} → {last}",
    "peak": "periodo {period}",
    "peakUnit": "{period} {unit}",
    "periodTitle": "Periodo",
    "periodUnitTitle": "Periodo ({unit})",
    "frequencyTitle": "Frecuencia (ciclos por observación)",
    "valueTitle": "Cuota de la varianza",
    "tooltipPeriod": "Periodo {period}",
    "tooltipPeriodUnit": "{period} {unit} por ciclo",
    "tooltipShare": "{share} de la varianza · {cycles} ciclos en el registro",
    "inside": "Por debajo del umbral",
    "outside": "Cruza el umbral de Fisher"
  },
  "annotations": []
}