 Posted 10/10/2007 2:57:42 PM
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| Hi. I am new to DA and was wondering if someone could help me understand what the term "two standard deviations" specifically means in the info regarding the Auto-Archive Feature "Additionally, the system will monitor your images and if they fall more than two standard deviations below the average for any particular award they are eligible for, they will be automatically archived."
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Posted 10/10/2007 3:15:58 PM
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Rather than setting a hard line at a particular numerical value, the system will monitor all images in the system that have won awards at the particular gate in question and calculate the threshold for two standard deviations below the mean for that gate.
In common terms, this simply means that if your image is scoring significantly below winning images for that gate (I'll explain gates below), then it will be archived in an attempt to create more votes for everyone.
Gates: There are gates tied to each set of awards. You can see this pdf for a better understanding of the awards that make up each gate. For each 'check' within the gate, the standard deviation computation is performed.
Eric
DailyAwards.com
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Posted 10/11/2007 5:03:32 AM
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| Thanks Eric. I think I understand this now :-)
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Posted 10/11/2007 2:37:30 PM
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| Hi Eric. Sorry for being a pest, but just want to make sure I really understand... If, lets say, the Average Winning Score [in any given category on any given day] was 7.5xxx, and an image in that same category, which had the required number of raw votes, but only scored 7.3xxx, would the image in question then be auto-archived?
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Posted 10/11/2007 4:28:18 PM
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| Most likely no. Standard deviation is a statistical measure of dispersion. The calculated StDev value is dependent on the values in the sample. Two samples could have the same average (mean) yet have wide standard deviations. Here are four Ten Vote Samples: Group 1: 7,7,7,7,7,7,7,7,7,7 = 70 Mean=7.0 StDev = 0.00 Group 2: 8,8,8,7,7,7,7,6,6,6, = 70 Mean= 7.0 StDev = 0.816 Group 3: 10,10,9,9,7,7,6,5,4,3 = 70 Mean = 7.0 StDev = 2.49 Group 4: 10,10,10,10,9,9,3,3,3,3 = 70 Mean = 7.0 StDev = 3.46 In all four examples the average rating is 7.0 but the Standard Deviation of the four samples ranges from 0.00 to 3.46. WE
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Posted 10/12/2007 6:02:05 AM
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Posted 10/12/2007 7:52:43 AM
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It does depend though!
If the image has collected a lot of votes, then it is no longer being checked at the category level. So, if you are a subscriber, you can check the advanced image stats page to see if it has a 'PASS' on the category level. At the same time, it may have a 'FAIL' at the monthly level and be archived. The image is still eligible to compete for all awards at monthly and below, it simply cannot continue to collect votes (thus it helps to keep the voting pool lean and provide more votes for everyone).
Eric
DailyAwards.com
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Posted 10/12/2007 10:08:45 AM
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| Thanks to you both for helping me understand.
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