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Author Topic: Funny stats - Drunk Inspector Ratio  (Read 4198 times)

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« on: April 08, 2011, 13:57 »
0
http://microstock.geneimages.com/dir (not really "big 4", but "bigger 5")

The calculation is done in assumption that absolutely drunk inspector makes absolutely random acceptance decision.

For the top 5 stock sites, we calculate how many images that have aggregate earnings of more than $5 were rejected, and how many images of the same amount of worst images (no-sellers for longest time) were accepted

Results are compared with random decision - 1/2 error rate

Results:

Stock               DIR
123rf             96%
iStockPhoto        61%
Dreamstime       41%
ShutterStock      38%
Fotolia               32%
« Last Edit: April 08, 2011, 18:10 by UncleGene »


WarrenPrice

« Reply #1 on: April 08, 2011, 14:08 »
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Shutterstock is catching up.   :P

« Reply #2 on: April 08, 2011, 14:27 »
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I'd like to see the accepted images that didn't sell in 3 months separated from the rejected images that made > $10 (a much worse inspection issue in my opinion).

The former would make any new site inspectors look drunk merely from the low # of sales.

« Reply #3 on: April 08, 2011, 18:08 »
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The former would make any new site inspectors look drunk merely from the low # of sales.
Low number of sales _across_ all sites = just bad image.

Statistics of only rejects of good images would give too much weight to sites with high acceptance rate, so it has to be counter-weighted with 'false-positive' one.

I found different problem - false-positive and false-negative got different weights. After fixing this, numbers (and positions) changed. I'll update original post. I am surprised - one of my worst sellers, FT, appears to be pretty good
« Last Edit: April 08, 2011, 18:10 by UncleGene »

« Reply #4 on: April 08, 2011, 18:56 »
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I'd like to see the accepted images that didn't sell in 3 months separated from the rejected images that made > $10 (a much worse inspection issue in my opinion).

Drunk Inspector Ratio 2

Second variation accounts only for rejections of good images, and does this proportionally to aggregate earnings of rejected image on other sites

Stock                DIR2
iStockPhoto       54%
Fotolia              53%
ShutterStock     40%
123rf                33%
Dreamstime      22%

« Reply #5 on: April 09, 2011, 07:03 »
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Interesting....

In may case IS would be waay out in front as they reject virtually everything and the others accept virtually everything.  This includes an isolated  variant on my best selling IS image (unusually rejected for commercial potential rather than "technical" issues), accepted by the all the others and outsells the non-isolated version by at least 2 to 1.


 

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