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servicetune
AE/Manager/Owner

Posts: 49

Class tested: 4

Last Online: Jun 23, 2016 11:51:58 GMT 1

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Incorrect failure rates Sept 2, 2015 16:03:06 GMT 1 gazza, dizzydiver, and 1 more like this

Post by servicetune on Sept 2, 2015 16:03:06 GMT 1

Has anyone noticed the way failure rates are calculated is wrong?

If we want to be sure of never going to a 4-2-2 system then might I suggest we stop using PRS. Every PRS test recorded shows up as a fail and a pass instead of a fail and re-test.

As any test we record as PRS was actually not roadworthy when it came in to the test station this should show as a fail.

Yesterday I tested 2 cars. First one passed, second one failed. I repaired the second one and entered the results as PRS. My figures for the month show a failure rate of 33.33%. If I had logged the second test as a fail, repaired it and re-tested it my fail rate would be 50%.

Is this a sneaky way of making the figures for un-roadworthy vehicles actually appear better than they are?

baz657
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Keeping safe

Posts: 4,703

Class tested: 1, 2, 3, 4, 5L, 7

Last Online: Apr 29, 2024 22:07:44 GMT 1

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Incorrect failure rates Sept 2, 2015 18:11:10 GMT 1 servicetune likes this

Post by baz657 on Sept 2, 2015 18:11:10 GMT 1

It's not something I'd noticed. Excellent observation servicetune. I have a feeling that this has always been the case since Comp 1, as even then if you PRS'd a test the test numbers were different for the pass and the fail. If that's right then the failure rate has been far worse for the past 10 yesrs than anybody thought!

I'll email somebody at DVSA and copy them into this.

The all new Hillside Garage website now open

Hooters VTS Council member Posts: 1,121 Class tested: 4, 5L, 7 Last Online: Apr 24, 2024 19:54:08 GMT 1 Likes: 782	Incorrect failure rates Sept 2, 2015 19:35:54 GMT 1 via mobile Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by Hooters on Sept 2, 2015 19:35:54 GMT 1 I asked DVSA similarly a while back and the reply I got did not answer the question. So I re worded it and received no answer, which was suspicious in itself. Please let me/us know if you have more success.
	Last Edit: Sept 2, 2015 21:12:11 GMT 1 by Hooters - All advice is given in good faith and may reflect personal opinion only. It is always your own decision whether or not to follow this advice/opinion. The author accepts no responsibility for your actions and any consequences of these.

ivor MOT tester "Failure is always an option." Mythbusters Posts: 1,981 Class tested: 4, 5L, 7 Last Online: Apr 8, 2023 11:19:45 GMT 1 Likes: 720	Incorrect failure rates Sept 2, 2015 19:38:42 GMT 1 via mobile servicetune and dizzydiver like this Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by ivor on Sept 2, 2015 19:38:42 GMT 1 Who was it said something like "there are lies dam lies and statistics "?

aylesburyjock Administrator Posts: 2,771 Class tested: 4, 7 Last Online: May 1, 2024 13:12:28 GMT 1 Likes: 1,866	Incorrect failure rates Sept 3, 2015 7:39:37 GMT 1 Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by aylesburyjock on Sept 3, 2015 7:39:37 GMT 1 I believe it was Mark twain, and I'm absolutely convinced he had government bodies in mind.

Deleted Posts: 0 Last Online: May 2, 2024 5:21:32 GMT 1	Incorrect failure rates Sept 3, 2015 9:33:55 GMT 1 Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by Deleted on Sept 3, 2015 9:33:55 GMT 1 Nice spot, hopefuly baz gets a reply that he can share with us

servicetune AE/Manager/Owner Posts: 49 Class tested: 4 Last Online: Jun 23, 2016 11:51:58 GMT 1 Likes: 22	Incorrect failure rates Nov 4, 2015 15:30:23 GMT 1 Back to Top Quote Select Post Deselect Post Link to Post Back to Top Post by servicetune on Nov 4, 2015 15:30:23 GMT 1 Any reply to this yet? baz657

dizzydiver
MOT tester

Posts: 835

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Last Online: May 2, 2024 0:32:42 GMT 1

Likes: 442

Incorrect failure rates Nov 4, 2015 15:53:32 GMT 1

Post by dizzydiver on Nov 4, 2015 15:53:32 GMT 1

i seem to remember writing something about lies written as numbers. and probably about the same subject. the only trouble with fail and retest, is can you get back online to retest it? with comp 1 at least you could print stats and see how the lies were made up!

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Incorrect failure rates

Post by servicetune on Sept 2, 2015 16:03:06 GMT 1

Post by baz657 on Sept 2, 2015 18:11:10 GMT 1

Post by Hooters on Sept 2, 2015 19:35:54 GMT 1

Post by ivor on Sept 2, 2015 19:38:42 GMT 1

Post by aylesburyjock on Sept 3, 2015 7:39:37 GMT 1

Post by Deleted on Sept 3, 2015 9:33:55 GMT 1

Post by servicetune on Nov 4, 2015 15:30:23 GMT 1

Post by dizzydiver on Nov 4, 2015 15:53:32 GMT 1