Old 05-08-2009, 12:34 AM   #1
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Default For the number guys. Photo formula.

What would be a good way to get a photo rating that uses view, comments, and favorites? Something like a passer rating in the NFL. Give me a formula.
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Old 05-08-2009, 01:26 AM   #2
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1*views + 10*favorites + 100*comments - 1000*Dewitzian HDR
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Old 05-08-2009, 02:19 AM   #3
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What about Hicksian saturation?
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Old 05-08-2009, 02:55 AM   #4
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What about Hicksian saturation?
Oh, I need a single term that encompasses all that. How about "overcooked"? Or "you've got to be kidding me!"? And what of Joe Blue, a lesser weight?

Oops, forgot the -50*unlevel factor (-500 if Jim Thias is doing the ratings).

Fortunately, we all now have high powered computers to handle such complex and rigorous calculations.
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Old 05-08-2009, 03:04 AM   #5
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Oops, forgot the -50*unlevel factor (-500 if Jim Thias is doing the ratings).
Ouch......unless Jim takes pride in that...
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Old 05-08-2009, 03:29 AM   #6
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Quote:
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1*views + 10*favorites + 100*comments - 1000*Dewitzian HDR
You have a typo - "- 1000*Dewitzian HDR" should be +1000*Dewitzian HDR

and who ever made up Dewitzian should get +3000 because that is just crazy.
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Old 05-08-2009, 03:32 AM   #7
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You have a typo - "- 1000*Dewitzian HDR" should be +1000*Dewitzian HDR

and who ever made up Dewitzian should get +3000 because that is just crazy.
It was in a recent thread, don't recall which one or who wrote it.
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Old 05-08-2009, 03:41 AM   #8
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earliest post ween 04.03.2009 9.03 pm.
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Old 05-08-2009, 04:32 PM   #9
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1*views + 10*favorites + 100*comments
Everyone thinks this works out as a good formula to score photos? I think it works but shouldn't it be divided or X like .2 or something so that the final number isn't so big?
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Old 05-08-2009, 04:42 PM   #10
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There would need to be a way to bring it all down to a standard rating, like out of 10.

If it weren't finals week, I'd figure out something. Maybe afterward, I should be able to figure something out.
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Old 05-08-2009, 04:44 PM   #11
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If you must, how do you factor in top shots, SC, etc.?
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Old 05-08-2009, 04:59 PM   #12
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Everyone thinks this works out as a good formula to score photos? I think it works but shouldn't it be divided or X like .2 or something so that the final number isn't so big?
C'mon, Travis! I just grabbed the 1/10/100 out of thin air, without thinking. To paraphrase Dogbert, they were just "biiiiig, rouuuud numbers!" It could be 1/5/250, it could be 1/200/202, it could be anything.

This is one way that pseudo-science begins, someone just makes up a number because it sounds good.

J, not a fan of false specificity.
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Old 05-08-2009, 05:03 PM   #13
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C'mon, Travis! I just grabbed the 1/10/100 out of thin air, without thinking. To paraphrase Dogbert, they were just "biiiiig, rouuuud numbers!" It could be 1/5/250, it could be 1/200/202, it could be anything.

This is one way that pseudo-science begins, someone just makes up a number because it sounds good.

J, not a fan of false specificity.
But I thought your numbers represented views, comments, and favorites well. I actually comment more then favorite myself but I think comments are worth more in most cases.
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Old 05-08-2009, 05:05 PM   #14
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If you must, how do you factor in top shots, SC, etc.?
Great point. I say only count PCA's as 1000 in a 1,10,100 system. Top of the week and 24 hour would be hard to keep track of and SC and POTW are views of 1 person and the views that position generates will bump up the photo enough.
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Old 05-08-2009, 05:07 PM   #15
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Interestingly, I just looked online, there is nothing that says how the parameters were chosen for the NFL passer rating formula. There are other sports formulas that are tied to specific outcomes, such as the many new baseball stats that ultimately tie to winning. But it does not appear that the NFL formula ties to a mix that leads to the highest probability of winning. I wonder how they did it.

At any rate, in photography there is no objective standard of best, the way winning is a standard in sports, so any formula will be lacking in meaning. One can still have fun with it.
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Old 05-08-2009, 05:07 PM   #16
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Quote:
Originally Posted by Slopes09 View Post
There would need to be a way to bring it all down to a standard rating, like out of 10.

If it weren't finals week, I'd figure out something. Maybe afterward, I should be able to figure something out.
Out of 10 is to small and generic. I like the passer rating (example 123.5) or maybe out of a 100.
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Old 05-08-2009, 05:08 PM   #17
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Interestingly, I just looked online, there is nothing that says how the parameters were chosen for the NFL passer rating formula. There are other sports formulas that are tied to specific outcomes, such as the many new baseball stats that ultimately tie to winning. But it does not appear that the NFL formula ties to a mix that leads to the highest probability of winning. I wonder how they did it.

At any rate, in photography there is no objective standard of best, the way winning is a standard in sports, so any formula will be lacking in meaning. One can still have fun with it.
We are about fun here at RP.
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Old 05-08-2009, 05:10 PM   #18
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But I thought your numbers represented views, comments, and favorites well. I actually comment more then favorite myself but I think comments are worth more in most cases.
That's fine, you like the 1/10/100 formula. But if I had started off with 1/50/100 instead, would you have objected, saying "you mucked it up, it obviously should be 1/10/100 instead" or would you have instead said, "yeah, that sounds good."

If you are trying to measure something, then start of by saying what it is you want to measure. If you want to have fun, well then, let's have fun!

J, taking this topic waaay too seriously.
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Old 05-08-2009, 05:13 PM   #19
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Four categories are used as a basis for compiling a rating:


• Percentage of completions per attempt
• Average yards gained per attempt
• Percentage of touchdown passes per attempt
• Percentage of interceptions per attempt



Remember that the statistic presented here measures passers, not quarterbacks - it does not quantify leadership, play calling, tenacity, or any of the other attributes of a great quarterback.



There are four individual steps in making the calculation - here is the math for each step:



Step 1: Start with completion percentage. Subtract 30 and

divide by 20.

Step 2: Yards per attempt. Subtract 3 and divide by 4.

Step 3: Touchdown passes divided by pass attempts and multiply by 20.

Alternatively, divide the touchdown percentage by 5.

Step 4: Start with 2.375. Subtract from that the interception percentage

(interceptions divided by pass attempts) divided by 4.



(Note: Sum of each step cannot be greater than 2.375 or less than 0.)



Add the sum of 1-4, multiply by 100 and divide by 6.


.
http://en.wikipedia.org/wiki/Passer_rating

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Old 05-08-2009, 05:24 PM   #20
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Quote:
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That's fine, you like the 1/10/100 formula. But if I had started off with 1/50/100 instead, would you have objected, saying "you mucked it up, it obviously should be 1/10/100 instead" or would you have instead said, "yeah, that sounds good."

If you are trying to measure something, then start of by saying what it is you want to measure. If you want to have fun, well then, let's have fun!

J, taking this topic waaay too seriously.
I think 1/30/100 would be as high as I would go with favorites since favoriting is just a click of a button, Mr. Serious. Could also go 1/10/50.
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Old 05-08-2009, 05:41 PM   #21
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Step 1: Start with completion percentage. Subtract 30 and

divide by 20.

Step 2: Yards per attempt. Subtract 3 and divide by 4.
The issue is not the numbers but where they came from. On what basis did they choose 30 and 20 instead of 25 and 10? On what basis did they choose 3 and 4 instead of 2 and 7? On what basis did they choose to sum the values for the four categories equally instead of placing more weight on some of them?

You can muck with the values and reward either a high-percentage short yardage person more or a low-percentage long ball QB more. Numbers sound objective but the formula is probably subjective to some degree.
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Old 05-08-2009, 07:25 PM   #22
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Let's simplify to binary:

Photo accepted: 1
Photo rejected: 0
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Old 05-08-2009, 07:34 PM   #23
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Quote:
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Let's simplify to binary:

Photo accepted: 1
Photo rejected: 0
Mr. Military wants to simplify - FAIL.

The 1/10/100 system still will not work for one reason. More views also equals better chances of more favorites and comments. So there will need to be a neutralizer that will take views against comments and favorites in a way that more views is worth more but also accounts for more favorites and comments generated by the views. Kinda like pass % and # of pass completions against pass attempts.
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Old 05-08-2009, 07:40 PM   #24
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Boooor-ring!
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Old 05-08-2009, 07:42 PM   #25
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You guys could take the fun out of a wet t-shirt contest!
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