※ 引述《VeryGoodBoy (很棒的男孩)》之銘言：
: 標題: [情報] 到美國時間2/2止 所有NBA球員TPA圖
: 時間: Sat Feb 5 17:50:51 2022
:
: 消息來源：(網址或出處)
: https://twitter.com/NBA_Math/status/1489254851943047168/photo/1
: 內容：
:
: Through games on Feb. 2, here's how all NBA players have fared on both ends
: of the floor during the 2021-22 season, per TPA.
:
: 本季到美國時間2/2的比賽為止，所有球員之TPA
:
: https://imgur.com/uEEd5yp
:
: 推 EQUP : 吹羊防守真這麼爛嗎= = 02/05 17:53
: 推 AWSMD : 崔養那個到底是怎樣 防守放推嗎 02/05 17:57
: 推 syamp : KD 不是整天被吹防守很罩？這圖代表什麼？ 02/05 17:59
: → skylove21 : 吹陽的防守就硬傷阿 進聯盟以來都這樣 02/05 17:59
: → live147222 : TPA也沒辦法很好的顯示防守啦，總不會真的說Jokic防 02/05 18:01
: → live147222 : 守聯盟獨一檔 02/05 18:01
: 推 dffa3491 : 每個對位Trae Young的都能硬打他，守不守沒什麼差 02/05 18:01
: 推 syamp : 阿肥前些時候就被誇防守功力大進，你不如說tpa不顯y 02/05 18:04
: → syamp : TPA不顯示進攻和防守好了，那TPA要看什麼？ 02/05 18:07
: 推 vhs97nu : 阿肥連防守都這麼鬼... 02/05 18:07
"TPA也沒辦法很好的顯示防守啦"
這個說法時不時會看見
不過為什麼呢? 我有點好奇
於是我試著去找了TPA的官方說明
首先 TPA是怎麼來的呢?
As such, the formula for TPA is rather simple. It’s broken down into two
parts—offensive points added (OPA) and defensive points saved (DPS)—and
each is calculated in the same vein.
OPA is derived by adjusting offensive box plus/minus (OBPM) to account for
the number of possessions the player in question is present for. Similarly,
DPS is derived from a similar adjustment of defensive box plus/minus (DBPM)
with that same number of possessions. OBPM and DBPM, both calculated by
Basketball-Reference.com, estimate the per-100-possessions value of a player
on either end of the court.
從上面文字說明可以知道
TPA分為進攻(OPA)和防守(DPS)兩項
分別由OBPM和DBPM推導而來
而由於Box Score數據在防守面並不完備
DBPM對防守評估並不是太準
這裡可以從BPM的官方介紹看到
Box Plus/Minus is a very good offensive metric, but it struggles some with
defense. As mentioned before, when all you have is a box score, you cannot
estimate defense very well. Not including minutes per game in the regression
also hampers the accuracy of the defensive estimates. In other words