{ "generated_on": "2026-10-11", "source": "ハードオフ オフモール（netmall.hardoff.co.jp）— 全ジャンルを同一チェーン・同一状態ランクで観測", "method": { "rank_scale": "S > A > B > C > D（ハードオフの状態ランク。全ジャンル共通）", "within_model": "同一機種（ブランド+型番）の中でランク別中央値を出し、その機種が持つ最良ランクを100%とした比を取り、機種ごとに1票としてジャンルでまとめた中央値", "diff_median": "rank_pairs[組].diff_median は、同じ機種で上下2つのランクが同時に在庫していた場合の【差額（円）】の中央値。hi_median は同じ機種群における上のランク側の価格中央値。金額はそのジャンルの価格水準を含むので、ジャンル間の大小はそのまま「状態の効き方の差」ではない", "naive": "同一機種でまとめずジャンル全体でランク別中央値を取っただけの値。機種構成の偏りがそのまま出るので参考値", "rank_pair_examples": "同じ機種で2つの状態ランクが同時に並んでいた実例を、機種名を出して並べたもの。組は候補がいちばん多い1組（A>B / B>C / C>D のいずれか）に固定し、上のランク側の価格の昇順に並べて端から端まで等間隔に10件を抜く（差額の大きい順に選ぶと極端な例だけの表になるため）。照合鍵（記号と空白を落とした型番）に複数の表記がぶら下がっている機種は、別の商品が同じ鍵に潰れている可能性があるので実例から外す。価格は同じ機種・同じランクの掲載価格の中央値で、候補が10機種に届かないジャンルは rows を null にする（0件という意味ではない）", "rank_mix": "並んでいる在庫のランク構成比。分母は【ランク表記のある在庫】で、表記のない在庫は unranked に件数で分けてある（0扱いにしない）。入荷の構成比でも市場全体の構成比でもなく、観測時点で並んでいたものの構成比。ランク表記のある在庫が200件未満のジャンルは null", "junk": "ハードオフが商品に付けた「ジャンク品」タグの割合。全ジャンルとも同じタグで判定する（商品名の文字列判定は艦ごとに広さが違うので使わない）。判定項目そのものを持たない艦は0%でなく未計測。share_of_unranked は「ランク表記のない在庫のうちジャンク品タグが付いている割合」の実測値", "junk_price": "同じ機種の中で「ジャンク品タグの付いた在庫」と「付いていない在庫」の掲載価格中央値を比べ、機種ごとに1票としてまとめた中央値（pct=通常品を100%としたときのジャンク品の価格／diff_median=差額の中央値／hi_median=同じ機種群の通常品側の価格中央値）。通常品側は状態ランクを問わない（S〜Dとランク表記なしの非ジャンクが混ざる）。ジャンル全体でジャンク／非ジャンクの中央値を並べると機種構成の偏りが出るので必ず同一機種内で比べる。higher/same は「ジャンク品のほうが高い／同額だった」機種数で、中央値だけを見て「ジャンクなら必ず安い」と読まれるのを防ぐために持つ。判定項目を持たない艦は0%でなく未計測", "gone": "初回観測から在庫落ちまでの日数。売れたのか出品取り下げなのかは区別できない。window_days は各ジャンルの観測期間（observed_from〜observed_to）で、median_days はこの期間より長い値が原理的に出ない＝観測期間の短いジャンルほど短く出る。ジャンル間で日数を比べるときは window_days を必ず併記する。seen_once/seen_once_pct は初回観測日と最終観測日が同じ個体（＝1回しか見かけないまま消えた個体）の件数と割合で、この個体は掲載期間0日として median_days に入る。割合はジャンルで0.8%〜82.0%と大きく違い（巡回がどれだけ細かく同じ商品ページを見に行けているかの差を含む）、売れ足の差ではない。median_days_multi/n_multi は2日以上見かけられた個体だけの中央値と件数で、こちらは長く並んだ個体ほど残る向きの偏りを持つ。実際の掲載期間は median_days（下限寄り）と median_days_multi（上限寄り）の間にあるとしか言えず、片方だけを掲載期間として引用してはいけない", "gone_by_band": "在庫落ちを掲載価格の帯（BANDS）で切り直した実数。n=その帯の在庫件数、gone=そのうち観測期間中に消えた件数、pct=その割合。率の水準は同じジャンルの中でだけ比べてよい（観測期間がジャンルごとに違うため、ジャンルをまたいだ率の比較は日数と同じ交絡になる）。分母には観測開始より前から並んでいた在庫も入る", "gone_by_rank": "在庫落ちを状態ランクで切り直した実数。rank=状態ランク、n=そのランクの在庫件数、gone=そのうち観測期間中に消えた件数、pct=その割合、price_median=そのランクの掲載価格の中央値。rank_mix に付けてきた但し書き（売れ足の速いランクは在庫として残りにくい）を実際に数えたもの。率の水準は同じジャンルの中でだけ比べてよい（観測期間がジャンルごとに違うため、ジャンルをまたいだ率の比較は gone_by_band と同じ交絡になる）。ランクによって並ぶ品物の値段が違い、価格帯そのものが消え方に効くので、price_median と gone_by_band を必ず併せて読む。分母には観測開始より前から並んでいた在庫も入る", "pricecut": "同じ個体（id）の価格履歴を追い、掲載価格が下がったかどうかを数えたもの。n_tracked=価格履歴を追えた在庫件数、n_down=最初に見た価格より最終価格が安くなった件数、n_up=高くなった件数、pct_down=その割合、cut_pct_median=下がった個体の下げ幅（初回価格を100としたとき）の中央値、cut_yen_median=同じく差額、cut_days_median=並び始めてから最初の値下げまでの日数、cut_times_median=値下げの回数。★aged_n / aged_down / aged_pct は「並んで aged_days 日以上たった個体」だけに絞った同じ割合で、左打ち切り（観測を始めた直後の個体はまだ下げられる時間が経っていない）を除くためのもの。ジャンル間で割合を比べるときはこちらを使う。ジャンル全体の価格中央値の推移ではないので、在庫の入れ替わりは混ざらない。価格履歴の項目そのものを持たない艦は0件でなく未計測", "step_by_price": "one_step と同じ3組（A>B・B>C・C>D、同一機種内・隣り合う1段）を、その機種の価格帯ごとに数え直したもの。bands の pct は「上のランクを100%としたときの下のランクの価格」の中央値、diff_median は差額、not_cheaper は下のランクのほうが高いか同額だった組数。帯を決める価格は【その機種がランク付きで並べている在庫全部の中央値】で、比の分子(lo)にも分母(hi)にも同じだけ寄るものを選んである。alt.hi / alt.lo は同じ組を「上のランクの価格」「下のランクの価格」で帯分けし直したもので、公開には使わない。この2つは同じ組から正反対の向きの結論を出す（帯を hi で切ると hi がたまたま高く出た組ほど上の帯に入り、その組の lo/hi が低く出る＝平均への回帰）。反転そのものを開示するために持っている", "one_step_flat": "one_step.flat は、one_step と同じ3組（A>B・B>C・C>D）を1組ずつ数えた内訳。lower_higher=下のランクのほうが高かった組数、same=同額だった組数、cheaper=下のランクが安かった組数。中央値だけを見て「ランクが下なら必ず安い」と読まれるのを防ぐために持つ", "price_spread": "掲載価格を安い順に並べたときの位置（p25=下から4分の1、p75=下から4分の3）と、共通の価格帯ごとの構成比。売れた価格ではなく並んでいる価格。ジャンルの品揃えをそのまま含むので、状態の効き方（同一機種内で計算）とは性質が違う。母数200件未満のジャンルは null" }, "genres": [ { "slug": "audio", "label": "オーディオ", "ship": "audiobench", "site": "https://audio-bench.com", "source": "ハードオフ オフモール(netmall.hardoff.co.jp・全国リユースチェーン中古オーディオ在庫・状態ランク付き)", "updated": "2026-09-21", "counts": { "items": 16492, "priced": 16492, "ranked": 14029, "with_model_key": 16407, "models_compared": 1155 }, "observed_from": "2026-08-06", "price_median": 27500, "price_spread": { "n": 16492, "p10": 5500, "p25": 11000, "p50": 27500, "p75": 66000, "p90": 154000, "bands": [ { "label": "5,000円未満", "lo": 0, "hi": 5000, "pct": 6.2, "n": 1023 }, { "label": "5,000〜1万円", "lo": 5000, "hi": 10000, "pct": 14.9, "n": 2451 }, { "label": "1万〜3万円", "lo": 10000, "hi": 30000, "pct": 33.5, "n": 5527 }, { "label": "3万〜10万円", "lo": 30000, "hi": 100000, "pct": 30.2, "n": 4982 }, { "label": "10万円以上", "lo": 100000, "hi": null, "pct": 15.2, "n": 2509 } ] }, "junk_pct": 12.7, "junk": { "measurable": true, "pct": 12.7, "n": 2097, "of": 16492, "with_rank": 5, "unranked": 2463, "share_of_unranked": 85.1, "note": null }, "junk_price": { "measurable": true, "n_models": 522, "pct": 54.1, "diff_median": 13200, "hi_median": 33000, "higher": 34, "same": 25, "pct_not_cheaper": 11.3, "note": null }, "rank_mix": { "n": 14029, "of_priced": 16492, "unranked": 2463, "unranked_pct": 14.9, "counts": { "S": 353, "A": 901, "B": 8608, "C": 3647, "D": 520 }, "pct": { "S": 2.5, "A": 6.4, "B": 61.4, "C": 26, "D": 3.7 }, "top_pct": 8.9, "d_pct": 3.7 }, "rank_naive": { "S": 13200, "A": 33000, "B": 27500, "C": 33000, "D": 19800 }, "rank_pairs": { "B>C": { "pct": 98, "n_models": 825, "diff_median": 550, "hi_median": 31350 }, "B>D": { "pct": 65, "n_models": 132, "diff_median": 11000, "hi_median": 36300 }, "C>D": { "pct": 67.5, "n_models": 131, "diff_median": 11000, "hi_median": 33000 }, "A>B": { "pct": 93.9, "n_models": 270, "diff_median": 1100, "hi_median": 33000 }, "A>C": { "pct": 83.3, "n_models": 114, "diff_median": 3300, "hi_median": 29700 }, "S>A": { "pct": 97.1, "n_models": 27, "diff_median": 1100, "hi_median": 49500 }, "S>B": { "pct": 90.9, "n_models": 49, "diff_median": 1100, "hi_median": 22000 }, "S>C": { "pct": 90, "n_models": 15, "diff_median": 1100, "hi_median": 12100 }, "A>D": { "pct": 66.3, "n_models": 8, "diff_median": 11990, "hi_median": 38390 }, "S>D": { "pct": 53.8, "n_models": 2, "diff_median": 8525, "hi_median": 16500 } }, "rank_pair_examples": { "pair": "B>C", "candidates": 689, "min": 10, "rows": [ { "name": "BOSE 111CL-III", "model_key": "BOSE|111CLIII", "pair": "B>C", "hi_rank": "B", "lo_rank": "C", "hi_price": 1650, "lo_price": 4400, "diff": -2750, "n_hi": 1, "n_lo": 1, "ratio": 2.667 }, { "name": "FOSTEX PM0.3", "model_key": "FOSTEX|PM03", "pair": "B>C", "hi_rank": "B", "lo_rank": "C", "hi_price": 8800, "lo_price": 8800, "diff": 0, "n_hi": 5, "n_lo": 1, "ratio": 1 }, { "name": "YAMAHA MSP5 STUDIO", "model_key": "YAMAHA|MSP5STUDIO", "pair": "B>C", "hi_rank": "B", "lo_rank": "C", "hi_price": 13200, "lo_price": 27500, "diff": -14300, "n_hi": 1, "n_lo": 1, "ratio": 2.083 }, { "name": "DENON DA-305", "model_key": "DENON|DA305", "pair": "B>C", "hi_rank": "B", "lo_rank": "C", "hi_price": 19800, "lo_price": 19800, "diff": 0, "n_hi": 1, "n_lo": 1, "ratio": 1 }, { "name": "TEAC W-890R", "model_key": "TEAC|W890R", "pair": "B>C", "hi_rank": "B", "lo_rank": "C", "hi_price": 26400, "lo_price": 27500, "diff": -1100, "n_hi": 2, "n_lo": 1, "ratio": 1.042 }, { "name": "DENON PMA-50", "model_key": "DENON|PMA50", "pair": "B>C", "hi_rank": "B", "lo_rank": "C", "hi_price": 38500, "lo_price": 22000, "diff": 16500, "n_hi": 4, "n_lo": 1, "ratio": 0.571 }, { "name": "DENON DP-500M", "model_key": "DENON|DP500M", "pair": "B>C", "hi_rank": "B", "lo_rank": "C", "hi_price": 55000, "lo_price": 44000, "diff": 11000, "n_hi": 3, "n_lo": 4, "ratio": 0.8 }, { "name": "MARANTZ SA-15S2", "model_key": "MARANTZ|SA15S2", "pair": "B>C", "hi_rank": "B", "lo_rank": "C", "hi_price": 77000, "lo_price": 71500, "diff": 5500, "n_hi": 2, "n_lo": 4, "ratio": 0.929 }, { "name": "LUXMAN A3500", "model_key": "LUXMAN|A3500", "pair": "B>C", "hi_rank": "B", "lo_rank": "C", "hi_price": 121000, "lo_price": 110000, "diff": 11000, "n_hi": 6, "n_lo": 3, "ratio": 0.909 }, { "name": "TANNOY CANTERBURY15", "model_key": "TANNOY|CANTERBURY15", "pair": "B>C", "hi_rank": "B", "lo_rank": "C", "hi_price": 880000, "lo_price": 770000, "diff": 110000, "n_hi": 1, "n_lo": 1, "ratio": 0.875 } ], "pool": { "n": 689, "higher": 226, "same": 122, "pct_not_cheaper": 50.5 }, "counts_by_pair": { "A>B": 205, "B>C": 689, "C>D": 113 } }, "one_step": { "pct": 94.2, "n": 1226, "diff_median": 1100, "hi_median": 33000, "flat": { "n": 1226, "lower_higher": 361, "same": 201, "cheaper": 664, "pct_lower_higher": 29.4, "pct_same": 16.4, "pct_not_cheaper": 45.8 } }, "step_by_price": { "anchor": "model_median", "n": 1226, "bands": [ { "label": "5,000円未満", "lo": 0, "hi": 5000, "n": 49, "pct": 100, "diff_median": 0, "not_cheaper": 33, "not_cheaper_pct": 67.3 }, { "label": "5,000〜1万円", "lo": 5000, "hi": 10000, "n": 111, "pct": 100, "diff_median": 0, "not_cheaper": 61, "not_cheaper_pct": 55 }, { "label": "1万〜3万円", "lo": 10000, "hi": 30000, "n": 444, "pct": 92.6, "diff_median": 1100, "not_cheaper": 199, "not_cheaper_pct": 44.8 }, { "label": "3万〜10万円", "lo": 30000, "hi": 100000, "n": 440, "pct": 92.9, "diff_median": 4400, "not_cheaper": 182, "not_cheaper_pct": 41.4 }, { "label": "10万円以上", "lo": 100000, "hi": null, "n": 182, "pct": 96.4, "diff_median": 5500, "not_cheaper": 87, "not_cheaper_pct": 47.8 } ], "alt": { "hi": [ { "label": "5,000円未満", "lo": 0, "hi": 5000, "n": 45, "pct": 100, "diff_median": 0, "not_cheaper": 37, "not_cheaper_pct": 82.2 }, { "label": "5,000〜1万円", "lo": 5000, "hi": 10000, "n": 117, "pct": 100, "diff_median": 0, "not_cheaper": 74, "not_cheaper_pct": 63.2 }, { "label": "1万〜3万円", "lo": 10000, "hi": 30000, "n": 432, "pct": 92.6, "diff_median": 1100, "not_cheaper": 194, "not_cheaper_pct": 44.9 }, { "label": "3万〜10万円", "lo": 30000, "hi": 100000, "n": 450, "pct": 92.6, "diff_median": 5225, "not_cheaper": 183, "not_cheaper_pct": 40.7 }, { "label": "10万円以上", "lo": 100000, "hi": null, "n": 182, "pct": 92.7, "diff_median": 11000, "not_cheaper": 74, "not_cheaper_pct": 40.7 } ], "lo": [ { "label": "5,000円未満", "lo": 0, "hi": 5000, "n": 58, "pct": 91.5, "diff_median": 413, "not_cheaper": 28, "not_cheaper_pct": 48.3 }, { "label": "5,000〜1万円", "lo": 5000, "hi": 10000, "n": 134, "pct": 87.5, "diff_median": 1100, "not_cheaper": 52, "not_cheaper_pct": 38.8 }, { "label": "1万〜3万円", "lo": 10000, "hi": 30000, "n": 435, "pct": 92, "diff_median": 1650, "not_cheaper": 192, "not_cheaper_pct": 44.1 }, { "label": "3万〜10万円", "lo": 30000, "hi": 100000, "n": 426, "pct": 95.9, "diff_median": 2200, "not_cheaper": 195, "not_cheaper_pct": 45.8 }, { "label": "10万円以上", "lo": 100000, "hi": null, "n": 173, "pct": 100, "diff_median": 0, "not_cheaper": 95, "not_cheaper_pct": 54.9 } ] } }, "gone": { "measurable": true, "n": 1931, "median_days": 0, "seen_once": 1001, "seen_once_pct": 51.8, "n_multi": 930, "median_days_multi": 12, "window_days": 46, "observed_from": "2026-08-06", "observed_to": "2026-09-21", "note": null }, "gone_by_band": [ { "label": "5,000円未満", "lo": 0, "hi": 5000, "n": 1023, "gone": 168, "pct": 16.4 }, { "label": "5,000〜1万円", "lo": 5000, "hi": 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