[Python-checkins] peps: PEP 418: Replace definitions of Accuracy, Precision and Resolution in the

victor.stinner python-checkins at python.org
Thu Apr 19 01:12:51 CEST 2012


http://hg.python.org/peps/rev/1ea7a3edec42
changeset:   4270:1ea7a3edec42
user:        Victor Stinner <victor.stinner at gmail.com>
date:        Thu Apr 19 01:12:50 2012 +0200
summary:
  PEP 418: Replace definitions of Accuracy, Precision and Resolution in the
glossary with Stephen J. Turnbull's definitions

files:
  pep-0418.txt |  17 +++++++----------
  1 files changed, 7 insertions(+), 10 deletions(-)


diff --git a/pep-0418.txt b/pep-0418.txt
--- a/pep-0418.txt
+++ b/pep-0418.txt
@@ -2,7 +2,7 @@
 Title: Add monotonic time, performance counter, and process time functions
 Version: $Revision$
 Last-Modified: $Date$
-Author: Cameron Simpson <cs at zip.com.au>, Jim Jewett <jimjjewett at gmail.com>, Victor Stinner <victor.stinner at gmail.com>
+Author: Cameron Simpson <cs at zip.com.au>, Jim Jewett <jimjjewett at gmail.com>, Stephen J. Turnbull <stephen at xemacs.org>, Victor Stinner <victor.stinner at gmail.com>
 Status: Draft
 Type: Standards Track
 Content-Type: text/x-rst
@@ -569,9 +569,8 @@
 ========
 
 :Accuracy:
-   Is the answer correct?  Any clock will eventually <drift>; if a
-   clock is intended to match <Civil Time>, it will need to be
-   <adjusted> back to the "true" time. See also `Accuracy and precision
+   The amount of deviation of measurements by a given instrument from
+   true values. See also `Accuracy and precision
    <http://en.wikipedia.org/wiki/Accuracy_and_precision>`_.
 
 :Adjusted:
@@ -639,10 +638,8 @@
    synchronization between cores.
 
 :Precision:
-   Significant Digits.  What is the smallest duration that the clock
-   can distinguish?  This differs from <resolution> in that a
-   difference greater than the minimum precision is actually
-   meaningful.
+   The amount of deviation among measurements of the same physical
+   value by a single instrument.
 
 :Process Time:
    Time elapsed since the process began.  It is typically measured in
@@ -657,8 +654,8 @@
    ambiguity; unfortunately, that introduces different ambiguities.
 
 :Resolution:
-   Represented Digits.  Note that many clocks will have a resolution
-   greater than their actual <precision>.
+   The smallest difference between two physical values that results
+   in a different measurement by a given instrument.
 
 :Slew:
    A slight change to a clock's speed, usually intended to correct

-- 
Repository URL: http://hg.python.org/peps


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