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11-07-2011, 01:29 PM   #1
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Different ratings in lens reviews

Perhaps I'm misunderstanding these, but it seems that in the lens review section, in some cases, is calculating two different ratings for some reviews.

As a case in point, the 18-55 WR kit lens (Pentax-DA 18-55mm F3.5-5.6 AL WR Reviews - DA Zoom Lenses - Pentax Lens Reviews & Lens Database) shows a "Calculated average" of 8.33, while it also shows an "Average User Rating" of 7.58. The latter is what is shown in the list of DA zooms. The 55-300, as another example, shows something similar, with simultaneous ratings of 8.85 & 8.43.

I havenŽt added up all the ratings to see which is correct, but can someone explain if IŽm missing something or if this is an error? I have taken a screenshot which IŽll upload if requested.

11-07-2011, 01:36 PM   #2
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Yeah, I've noticed that. The ratings on the front page (listing all the lenses in a category) are not the same ratings as when you click through to a particular lens...
11-07-2011, 02:30 PM   #3
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Calculated average = average based on user sub-scores
User average = average of user overall ratings

Do we see a bias here?

Adam
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11-08-2011, 01:13 AM   #4
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QuoteOriginally posted by Adam Quote
Calculated average = average based on user sub-scores
User average = average of user overall ratings

Do we see a bias here?
Is the overall rating not based on the sub-scores?

I think having two ratings is confusing. My feeling is that there should be only one, or failing that, a clearer explanation (on each review page) should be given to explain the difference.

11-08-2011, 09:58 PM   #5
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Once we get more data points the plan is to switch over to the weighted system- but as of right now there are lots of lenses with only 1 or 2 such ratings.

Adam
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