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Topics: Quality
accuracy vs precision
accuracy vs precision
Which one do you measure? Do you spend more time on one than the other?
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Network:4579
Both. You can be precise but inaccurate.
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1 reply by David Hernandez
Nov 09, 2016 7:01 PM
David Hernandez
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I appreciate your help, Thanks a lot.
You need to measure both as they both contribute towards quality. Please refer the the below link for simple definitions & examples:

"Accuracy vs. Precision"
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2 replies by David Hernandez and Vincent Guerard
Nov 09, 2016 7:01 PM
David Hernandez
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thanks
Nov 09, 2016 10:05 PM
Vincent Guerard
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Thanks nice reference
The answer is inside the defintion of what estimation is.See the theory and you will find the answer.
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1 reply by David Hernandez
Nov 09, 2016 7:02 PM
David Hernandez
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thanks
I don't measure either. They're measurement system attributes. They both have to be specified and in control before you start to measure something.

Accuracy is how close a measured value (sample) is to the actual (true) value.
Precision is how close the measured values (samples) are to each other.
If you want to verify how much your processes are effective you may use both "precision" and "accuracy". Outputs from a specific process are consistent but out of required target, you should adjust your process because it is considered as a relatively high precision but low accuracy. Things are not consistent and out of target, you may need to improve and adjust your process because they are considered as neither precision nor accuracy, which means root cause should be identified and actions should be taken to correct and prevent the problems in your process.

When you want to verify the correctness in your deliverables you should use "accuracy".
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1 reply by David Hernandez
Nov 04, 2016 8:50 PM
David Hernandez
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Thanks, this help me out.
Nov 04, 2016 8:27 PM
Replying to Sungjoon Park
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If you want to verify how much your processes are effective you may use both "precision" and "accuracy". Outputs from a specific process are consistent but out of required target, you should adjust your process because it is considered as a relatively high precision but low accuracy. Things are not consistent and out of target, you may need to improve and adjust your process because they are considered as neither precision nor accuracy, which means root cause should be identified and actions should be taken to correct and prevent the problems in your process.

When you want to verify the correctness in your deliverables you should use "accuracy".
Thanks, this help me out.
First you make sure your instrument is precise then ultimately it is accuracy that matters, how close is your reading to true value.
Dp you think that when performing estimation on all related to Project precision has sense?

Depending on the requirements of the project, you might have to measure both


Sorry, but precision has no sense in the field of project management. You have to take into account two things: 1-the definition of both terms from the field of mathematics and the theory of errors. 2-the hugh difference between measure over the product and measures over the project.
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