French
DeutschFile:P control chart.svg
Size of this PNG preview of this SVG file: 600 × 599 pixels. Other resolutions: 240 × 240 pixels | 481 × 480 pixels | 769 × 768 pixels | 1,026 × 1,024 pixels | 2,051 × 2,048 pixels | 630 × 629 pixels.
Original file (SVG file, nominally 630 × 629 pixels, file size: 38 KB)
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Summary
| Description | English: Example en:p-chart for a process that experienced a 1.5σ drift starting at midnight. |
| Date | |
| Source | Own work |
| Author | DanielPenfield |
Creation technique
- Simulate process observations using en:perl, output to file.
- Read file into R, use qcc package to render control chart.
- Save to PDF.
- Import into en:Inkscape, save to SVG.
#!/usr/bin/perl -w use strict; use Math::Random; my %shiftSchedule = ( "first" => { "start" => 6.00, "end" => 14.00 }, "second" => { "start" => 14.00, "end" => 22.00 }, "third" => { "start" => 22.00, "end" => 6.00 } ); my $shift = "third"; # shift to monitor my $inspectionRate = 1 / 2; # every 1/2 hour my $drift = 1.5; # sigma drift to simulate my $m = 25; # samples in control chart setup my $target = 0.10; # fraction nonconforming target my $p = $target; my $n = # observations per sample int((9 * $p * (1 - $p)) / ($drift * $p * $drift * $p) + 0.5); my $hour; my $i; my $minute; my $observation; my $setupM = $m; print "timestamp sample sampleSize observation phase\r\n"; for ($i = 1; $i <= $m; $i++) { $observation = Math::Random::random_binomial(1, $n, $p); printf " 0:00 %6d %6d %2d setup\r\n", $i, $n, $observation; } $m = $shiftSchedule{$shift}{"end"} - $shiftSchedule{$shift}{"start"}; if ($m < 0) { $m += 24; } $m /= $inspectionRate; for ($i = 1; $i <= $m; $i++) { $hour = int($i * $inspectionRate + $shiftSchedule{$shift}{"start"}); if ($hour >= 24) { $hour -= 24; } $minute = ($i & 0x1) ? (60 * $inspectionRate) : 0; if ($i >= (0.25 * $m)) { if ($i < (0.75 * $m)) { $p = $target + ($drift * $target / (0.5 * $m)) * ($i - (0.25 * $m)); } else { $p = $target + $drift * $target; } } $observation = Math::Random::random_binomial(1, $n, $p); printf " %2d:%02d %6d %6d %2d monitoring\r\n", $hour, $minute, $setupM + $i, $n, $observation; }
Licensing
I, the copyright holder of this work, hereby publish it under the following licenses:
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
 | Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. |
You may select the license of your choice.
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:49, 16 January 2010 | | 630 × 629 (38 KB) | DanielPenfield | {{Information |Description={{en|1=Example en:p-chart for a process that experienced a 1.5σ drift starting at midnight.}} |Source={{own}} |Author=DanielPenfield |Date=2010-01-16 |Permission= |other_versions= }} [[Category:Con |
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