chart op• データ種: matrix → table
• 呼び出し: import fullseye as fs; fs.ledger.spc_xbar_r(subgroups) (実装を直接呼ぶなら import spc; spc.spc_xbar_r(subgroups)、台帳から引くなら opsspc.get("spc_xbar_r"))
部分群計測からの Shewhart Xbar-R 管理図(ISO 8258 定数で管理限界と逸脱を出す)。
> 以下の詳細説明は原文のままです —— 要約と見出しは訳出済み。
`subgroups is a 2-D array of shape (m, n) — m subgroups of n`
measurements each, `2 <= n <= 10` (the range chart is only calibrated for
small subgroups). For each subgroup `j` the plotted statistics are the mean
`Xbar_j and the range R_j = max - min`. The centre lines are the grand
mean `Xbarbar and the mean range Rbar`, and with the ISO 8258 constants
`(A2, D3, D4) for that n`::
xbar_ucl = Xbarbar + A2*Rbar xbar_lcl = Xbarbar - A2*Rbar
r_ucl = D4*Rbar r_lcl = D3*Rbar
Returns a dict (a "table") with the per-subgroup `xbar / r` arrays, the
six limits and three centre lines, the integer indices `out_of_control` of
subgroups outside either chart, and `in_control` (True when that list is
empty). The constants are fixed by `n: for n=5` they are exactly
`A2=0.577, D3=0.000, D4=2.115` (pinned in the tests).
Raises `ValueError`: a non-2-D / empty *subgroups*, a subgroup size
outside `[2, 10]`, or non-finite / mislabelled input.
• サンプルデータ カタログ(DL URL / ライセンス) — 2-D は skimage.data(BSD/public)+ 合成、3-D は実データ源(Stanford/PDS 等)の DL URL。
• 演算子の来歴・参考文献 — この op 族の元になった研究/手法の出典。
• アルゴリズムの正典(著者・年)と用途は上記ファミリ使い方ガイドに記載。
• poc_spc — py -3.11 examples/poc_spc.py
table を入力に取れる)—
chart)—
*Provenance: spc.py — SPC operator registry. この per-op ノートは tools/opdocs.py md が自動生成(手編集しない)。*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.