Sometimes we still confuse about the differences between Accuracy and Resolution in Measurement System. Here we find some people opinion about this :
Stijloor from North Carolina (Cross Forum Moderator @ Elsmar.com response :
Are you referring to this?
Accuracy: The closeness of a measurement to the actual value being measured.
Resolution: The smallest detectable increment that an instrument will measure/display to.
West Bucey (Quality Manager) from Illionis response :
Is there a possibility you mean the word "accuracy" versus "accuration?" - if so, click the report button to explain and whichever moderator is on duty during that time period will help you change the thread title.
If it is "accuracy,"perhaps this might help:
From the NIST Handbook
NIST/SEMATECH e-Handbook of Statistical Methods, http://www.itl.nist.gov/div898/handbook/, date
Specific page for glossary:
http://www.itl.nist.gov/div898/handbook/glossary.htm
accuracy In metrology, the total measurement variation, including not only precision (reproducibility), but also the systematic offset between the average of measured values and the true value.
resolution
1. In experimental design, especially for two-level designs, the length of the word of the shortest confounding relationship. Geometrically, design resolution corresponds to the 1 plus the strength.
2. In metrology, the number of significant digits of a measurement system that can be meaningfully interpreted.
Bobdoering from LaGrange response :
My definitions (everybody has one...), with a few bonus definitions:
Precision: degree of “fineness” or resolution
Can be checked by Repeatability – the ability to duplicate the result
Accuracy: conformity to a standard
Checked against a standard
Resolution (or Discrimination):
-The amount of change from a reference value that an instrument can detect and faithfully indicate. This is also referred to as readability or resolution
-The measure of this ability is typically the value of the smallest graduation on the scale of the instrument. If the instrument has ‘coarse’ graduations, then a half-graduation can be used
-A general rule of thumb is the measuring instrument discrimination ought to be at least one-tenth of the range to be measured (10 to 1 rule), or one tenth of the process variation.
ndc (number of discriminate categories): an evaluation of the statistically significant discrimination
Metrology is the science of measurement; of mass, time and length (the primary quantities)
Measurement is the “language” of science
Mensuration is the branch of applied geometry that is concerned with finding the length of lines, areas of surfaces, and volumes of solids from simple data of lines and angles
Types of Measurement Error
Tool Error – inherent instrument error
Observational Error – error from the eye
Manipulative Error – error from the hand
Bias – unconscious influence causing error
For more measurement lingo:
Measurement System Analysis from MoreSteam
Dmadance (Shy Poster @ Elsmar.com) response :
Resolution is the smallest change that an instrument can detect, accuracy is a subjective term referring to how close an instrument can be assumed to measure the true value of a quantity.
It is often the case that a given instrument may have less accuracy than resolution. This is not an unusual concept, lets say one measures the ratio between two voltages, one measurement gives 1.0 +/- 0.1 V, and another gives 3.0 +/- 0.2 V. Well an instrument could divide 1.0 by 3.0 and get the result 0.33333 V. In this case one is displaying more resolution than the measurement is accurate. In other words instruments can give more significant digits in a result than are justified by its accuracy. This is not necessarily a bad thing. Sometimes an instrument can measure changes in a quantity more accurately than the quantity itself for instance.
My website, LearningMeasure.com has courses available that can explain issues like this in more detail.
Stijloor from North Carolina (Cross Forum Moderator @ Elsmar.com response :
Are you referring to this?
Accuracy: The closeness of a measurement to the actual value being measured.
Resolution: The smallest detectable increment that an instrument will measure/display to.
West Bucey (Quality Manager) from Illionis response :
Is there a possibility you mean the word "accuracy" versus "accuration?" - if so, click the report button to explain and whichever moderator is on duty during that time period will help you change the thread title.
If it is "accuracy,"perhaps this might help:
From the NIST Handbook
NIST/SEMATECH e-Handbook of Statistical Methods, http://www.itl.nist.gov/div898/handbook/, date
Specific page for glossary:
http://www.itl.nist.gov/div898/handbook/glossary.htm
accuracy In metrology, the total measurement variation, including not only precision (reproducibility), but also the systematic offset between the average of measured values and the true value.
resolution
1. In experimental design, especially for two-level designs, the length of the word of the shortest confounding relationship. Geometrically, design resolution corresponds to the 1 plus the strength.
2. In metrology, the number of significant digits of a measurement system that can be meaningfully interpreted.
Bobdoering from LaGrange response :
My definitions (everybody has one...), with a few bonus definitions:
Precision: degree of “fineness” or resolution
Can be checked by Repeatability – the ability to duplicate the result
Accuracy: conformity to a standard
Checked against a standard
Resolution (or Discrimination):
-The amount of change from a reference value that an instrument can detect and faithfully indicate. This is also referred to as readability or resolution
-The measure of this ability is typically the value of the smallest graduation on the scale of the instrument. If the instrument has ‘coarse’ graduations, then a half-graduation can be used
-A general rule of thumb is the measuring instrument discrimination ought to be at least one-tenth of the range to be measured (10 to 1 rule), or one tenth of the process variation.
ndc (number of discriminate categories): an evaluation of the statistically significant discrimination
Metrology is the science of measurement; of mass, time and length (the primary quantities)
Measurement is the “language” of science
Mensuration is the branch of applied geometry that is concerned with finding the length of lines, areas of surfaces, and volumes of solids from simple data of lines and angles
Types of Measurement Error
Tool Error – inherent instrument error
Observational Error – error from the eye
Manipulative Error – error from the hand
Bias – unconscious influence causing error
For more measurement lingo:
Measurement System Analysis from MoreSteam
Dmadance (Shy Poster @ Elsmar.com) response :
Resolution is the smallest change that an instrument can detect, accuracy is a subjective term referring to how close an instrument can be assumed to measure the true value of a quantity.
It is often the case that a given instrument may have less accuracy than resolution. This is not an unusual concept, lets say one measures the ratio between two voltages, one measurement gives 1.0 +/- 0.1 V, and another gives 3.0 +/- 0.2 V. Well an instrument could divide 1.0 by 3.0 and get the result 0.33333 V. In this case one is displaying more resolution than the measurement is accurate. In other words instruments can give more significant digits in a result than are justified by its accuracy. This is not necessarily a bad thing. Sometimes an instrument can measure changes in a quantity more accurately than the quantity itself for instance.
My website, LearningMeasure.com has courses available that can explain issues like this in more detail.
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