Pintubigfoot

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Follow up to your RFC on Mean Time Between Failures

I wonder if you could review the discussion in http://en.wikipedia.org/wiki/Talk:Mean_time_between_failures#Discussion_references where there is a line by line break down of the section and where the source material came from. Your comments indicate the source are insufficient, is that the case?

The 2nd controvercy is based on the theory that in Actual MTBF, devices that did not fail are excluded from the experminental results. This is the part that is not sourced. NYCDA (talk) 22:24, 31 January 2008 (UTC)

Thanks for the comment. I have gone through them all:

• 1st controvercy is more about the credibility of the formula (not the source):

• Though if you may have tons of sources, editors will still dispute it if there is no sufficient proof for it. It is like to say "4*3 is not equal to 4+4+4". One will immediately dispute the theory if someone tries to write that 4*3 does not have relationship with 4+4+4.
• I also saw the sources that you had provided there (especially from CMU). Basically I also doubt for that source since it is not an official publication from CMU. It is only a reference taken from www.faqs.org and kept by someone in his homepage. Furthermore, that source is used only in 2001 lecture (and not used anymore for the current lectures)

• For the 2nd controvercy, I don't see any controvercies to it:

• MTBF = mean time between failures. If an item does not possess at least 2 consecutive failures, then it cannot be included in the calculation.
• Let say you produce 2 billion LEDs (or even more) in 1 batch:

• Afterwards you run a test to all of them for about 1 second and notice 2 LEDs to get blown.
• It is silly that you then publish the MTBF to have 1 billion seconds for a small test that has just gone through for 1 second duration run.
• When the MTBF is very high with ridiculous number, you are going to dispute that MTBF is not to be confused with LE. This is what you are going to say in your article (1st RFC), right?

Pintubigfoot (talk) 06:01, 13 February 2008 (UTC)

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Orphaned non-free media (Image:Sejarah SMP 1 Saidihardjo Sardiman TS.jpg)

Thanks for uploading Image:Sejarah SMP 1 Saidihardjo Sardiman TS.jpg. The media description page currently specifies that it is non-free and may only be used on Wikipedia under a claim of fair use. However, it is currently orphaned, meaning that it is not used in any articles on Wikipedia. If the media was previously in an article, please go to the article and see why it was removed. You may add it back if you think that that will be useful. However, please note that media for which a replacement could be created are not acceptable for use on Wikipedia (see our policy for non-free media).

If you have uploaded other unlicensed media, please check whether they're used in any articles or not. You can find a list of 'image' pages you have edited by clicking on the "my contributions" link (it is located at the very top of any Wikipedia page when you are logged in), and then selecting "Image" from the dropdown box. Note that all non-free media not used in any articles will be deleted after seven days, as described on criteria for speedy deletion. Thank you. BetacommandBot (talk) 19:43, 17 February 2008 (UTC)