{
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  "reviewed": "2026-10-24",
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      "id": "PH_PENNER",
      "title": "Penner (2002), The physics of putting",
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      "type": "published_physics_model",
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    },
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      "title": "Sheppard, Hurrion & Collinson (2016), An Investigation into Golf Ball Speed at Hole Entry",
      "url": "https://www.paulhurrion.com/tuition/an-investigation-into-golf-ball-speed-at-hole-entry/",
      "type": "device_experiment",
      "note": "3 degrees (5.24%), not 3 percent. Ring is 30cm from cup circumference; speed measured at FRONT. Result-section clock labels/means used, inconsistent summary not used. Repetitions per cell not stated."
    },
    {
      "id": "PH_BROADIE",
      "title": "Broadie & Shin (2014), Golf Analytics: A Random Putting Model…",
      "url": "https://www.waddengolfacademy.com/putting/Broadie%20Shin%20A%20Random%20Putting%20Model.pdf",
      "type": "author_calibrated_working_paper_model",
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    },
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      "url": "https://pelzgolf.com/tribute/",
      "type": "instructor_recommendation",
      "note": "Official page specifies 17 inches =43.18cm, not 18 inches =45.72cm. No raw study sample or stratification on this page."
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      "title": "Hasegawa, Okada & Fujii (2024), Putting performance bias…",
      "url": "https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0314820",
      "type": "player_experiment",
      "note": "12 professionals and 12 amateurs, artificial turf, 3m, slopes 1 and 3 degrees. No visual outcome feedback. Final stopping position not recorded; no observed return-putt length derived."
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      "location": "front_of_hole",
      "surface": "Huxley Stimp 10",
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      "uncertaintyDefinitionInWebText": null,
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      "individualRecommendation": false
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