Sunday, 27 April 2014

Accuracy And Precision

In my DSP classes I often cover the difference between precision and accuracy when measuring and processing input values from a transducer.
I recently came across an excellent little illustration of this on page 7 of the Keller-Druck Brochure : http://flipflashpages.uniflip.com/2/52802/96120/pub/#page7.

From a signal processing point of view the key points from this diagram are :
  1/ When the measurements are very precise (as shown in diagram A) then accuracy can be improved by removing the offset via subtraction of the average of the samples.
  2/ When measurements are more accurate but there is a larger deviation (as shown in diagram B) then the deviation can be reduced by oversampling and averaging the results.

If you have found this solution useful then please do hit the Google (+1) button so that others may be able to find it as well.
Numerix-DSP Libraries : http://www.numerix-dsp.com/eval/

2 comments:

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  2. I remember sitting in my eight-grade physics class when my instructor mentioned that the day’s lesson would contain a discussion about accuracy and precision, and how both relate to making experimental measurements. I have learned that if you are starting a quality enhancement project that includes collecting data to control quality or to monitor alterations in your processes, it’s important that your systems for gathering measurements accurately. In education system a person get knowledge and buy a degree online. This thing not only enhances your skills to think with accuracy but it also helps to do work within time frame.

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