{ "summary": { "generated_from": "data/db-snapshot (assignments.json, books.json, grades.json, states.json)", "total_assignments": 13258, "books_analysed": 1597, "min_assignments_per_book": 3, "median_spread_grades": 4, "books_spanning_3plus_grades": 1325, "pct_spanning_3plus_grades": 83.0, "spread_distribution": { "0": 8, "1": 28, "2": 236, "3": 434, "4": 235, "5": 353, "6": 115, "7": 188 }, "publisher_band_agreement": { "comparable_books": 1597, "median_delta_grades": 0.0, "diverge_by_1plus_grade": 45, "note": "Observed placement agrees with published bands on average. The finding is spread, not error." } }, "books": [ { "slug": "wonder", "title": "Wonder", "author": "R.J. Palacio", "lexile": 790, "published_grade_min": 3, "published_grade_max": 7, "observed_grade_min": 3, "observed_grade_max": 7, "observed_grade_median": 5.0, "spread": 4, "assignments": 148, "states": 29, "sources": 30 }, { "slug": "new-kid", "title": "New Kid", "author": "Jerry Craft", "lexile": null, "published_grade_min": 4, "published_grade_max": 8, "observed_grade_min": 3, "observed_grade_max": 8, "observed_grade_median": 6, "spread": 5, "assignments": 109, "states": 20, "sources": 19 }, { "slug": "shiloh", "title": "Shiloh", "author": "Phyllis Reynolds Naylor", "lexile": 890, "published_grade_min": 3, "published_grade_max": 6, "observed_grade_min": 3, "observed_grade_max": 7, "observed_grade_median": 5.0, "spread": 4, "assignments": 104, "states": 25, "sources": 23 }, { "slug": "holes", "title": "Holes", "author": "Louis Sachar", "lexile": 660, "published_grade_min": 4, "published_grade_max": 7, "observed_grade_min": 3, "observed_grade_max": 7, "observed_grade_median": 5.0, "spread": 4, "assignments": 96, "states": 22, "sources": 22 }, { "slug": "maniac-magee", "title": "Maniac Magee", "author": "Jerry Spinelli", "lexile": 820, "published_grade_min": 4, "published_grade_max": 7, "observed_grade_min": 3, "observed_grade_max": 7, "observed_grade_median": 5, "spread": 4, "assignments": 87, "states": 20, "sources": 20 }, { "slug": "because-of-winn-dixie", "title": "Because of Winn-Dixie", "author": "Kate DiCamillo", "lexile": 610, "published_grade_min": 3, "published_grade_max": 5, "observed_grade_min": 3, "observed_grade_max": 6, "observed_grade_median": 4.0, "spread": 3, "assignments": 84, "states": 26, "sources": 26 }, { "slug": "refugee", "title": "Refugee", "author": "Alan Gratz", "lexile": 800, "published_grade_min": 5, "published_grade_max": 9, "observed_grade_min": 5, "observed_grade_max": 9, "observed_grade_median": 7, "spread": 4, "assignments": 83, "states": 18, "sources": 16 }, { "slug": "diary-of-a-wimpy-kid", "title": "Diary of a Wimpy Kid", "author": "Jeff Kinney", "lexile": 950, "published_grade_min": 3, "published_grade_max": 7, "observed_grade_min": 3, "observed_grade_max": 7, "observed_grade_median": 5, "spread": 4, "assignments": 81, "states": 16, "sources": 13 }, { "slug": "escape-from-mr-lemoncellos-library", "title": "Escape from Mr. Lemoncello's Library", "author": "Chris Grabenstein", "lexile": null, "published_grade_min": 4, "published_grade_max": 6, "observed_grade_min": 3, "observed_grade_max": 8, "observed_grade_median": 5.0, "spread": 5, "assignments": 80, "states": 23, "sources": 23 }, { "slug": "the-tale-of-despereaux", "title": "The Tale of Despereaux", "author": "Kate DiCamillo", "lexile": 670, "published_grade_min": 3, "published_grade_max": 6, "observed_grade_min": 3, "observed_grade_max": 7, "observed_grade_median": 5.0, "spread": 4, "assignments": 78, "states": 17, "sources": 16 }, { "slug": "frindle", "title": "Frindle", "author": "Andrew Clements", "lexile": 830, "published_grade_min": 3, "published_grade_max": 7, "observed_grade_min": 3, "observed_grade_max": 7, "observed_grade_median": 5, "spread": 4, "assignments": 71, "states": 15, "sources": 11 }, { "slug": "out-of-my-mind", "title": "Out of My Mind", "author": "Sharon M. 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}, { "slug": "old-yeller", "title": "Old Yeller", "author": "Fred Gipson", "lexile": null, "published_grade_min": 5, "published_grade_max": 8, "observed_grade_min": 5, "observed_grade_max": 8, "observed_grade_median": 6.5, "spread": 3, "assignments": 32, "states": 8, "sources": 4 }, { "slug": "rascal", "title": "Rascal", "author": "Sterling North", "lexile": null, "published_grade_min": 5, "published_grade_max": 8, "observed_grade_min": 5, "observed_grade_max": 8, "observed_grade_median": 6.5, "spread": 3, "assignments": 32, "states": 8, "sources": 4 }, { "slug": "dog-man", "title": "Dog Man", "author": "Dav Pilkey", "lexile": 390, "published_grade_min": 2, "published_grade_max": 5, "observed_grade_min": 2, "observed_grade_max": 5, "observed_grade_median": 4, "spread": 3, "assignments": 31, "states": 8, "sources": 4 }, { "slug": "king-of-the-wind", "title": "King of the Wind", "author": "Marguerite Henry", "lexile": null, "published_grade_min": 3, "published_grade_max": 7, "observed_grade_min": 3, "observed_grade_max": 7, "observed_grade_median": 5.0, "spread": 4, "assignments": 30, "states": 5, "sources": 2 }, { "slug": "odder", "title": "Odder", "author": "Katherine Applegate", "lexile": null, "published_grade_min": 3, "published_grade_max": 5, "observed_grade_min": 3, "observed_grade_max": 5, "observed_grade_median": 4.0, "spread": 2, "assignments": 30, "states": 9, "sources": 10 }, { "slug": "the-city-of-ember", "title": "The City of Ember", "author": "Jeanne DuPrau", "lexile": null, "published_grade_min": 4, "published_grade_max": 6, "observed_grade_min": 4, "observed_grade_max": 6, "observed_grade_median": 5.0, "spread": 2, "assignments": 30, "states": 9, "sources": 10 }, { "slug": "the-lost-hero", "title": "The Lost Hero", "author": "Rick Riordan", "lexile": null, "published_grade_min": 5, "published_grade_max": 9, "observed_grade_min": 5, "observed_grade_max": 9, "observed_grade_median": 7, "spread": 4, "assignments": 29, "states": 6, "sources": 2 }, { "slug": "mrs-frisby-and-the-rats-of-nimh", "title": "Mrs. Frisby and the Rats of NIMH", "author": "Robert C. 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B. 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