How do the charts work?

- graceless said...
- User
- 29 Jan 2006, 14:58
How do the charts work?

I am just curious as to how the community chart is generated.

On my personal weekly profile for 15 - 22 Jan, it had Tool down for 21. Then on the Canberra one, it had it down for 6 over the same period.

Do the numbers attached to the charts within the community refer to the number of members that listened to a specific artist rather than how many times it was listened to?

I think that must be it, but if anyone knows, please let me know.

[quote][b][user]graceless[/user][/b] said: I am just curious as to how the community chart is generated. On my personal weekly profile for 15 - 22 Jan, it had Tool down for 21. Then on the Canberra one, it had it down for 6 over the same period. Do the numbers attached to the charts within the community refer to the number of members that listened to a specific artist rather than how many times it was listened to? I think that must be it, but if anyone knows, please let me know. [/quote]

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- jk- said...
- User
- 28 Feb 2006, 08:08
So, the charts work like this:

faxed, our fearless last.fm Canberra group leader, goes to the CD store and asks for the 15 CDs that have been on the shelves for the longest. You know, the type that are in prominent display next to the "20 polka hits of 1984" and "elevator classics" albums, below the poster of the latest Home and Away tie-in CD.

Then, because his job at the corn factory doesn't pay him much, he has to run out of the store without paying for the CDs. This is usually followed by a 5-minute faxed-gets-chased-by-security-guards event, but he almost always makes it out safely. We're all trying to forget about that time that he didn't.

He then takes the CDs to his loungeroom, and lays them out in a 5-by-3 grid. Standing to one side, he'll fill his mouth with as many potato crisps as is possible. One of his flatmates is charged with the task of punching him squarely in the abdomen, causing the chips to burst out and scatter all over the CDs. The album with the most chips on it goes at number one on the charts, the CD with the next-highest chip density will go at second, and so forth. He'll then patiently clean up the mess of CDs and potato crisps, in order to do the same task next week.

So there you go.

But somewhat more seriously: I had assumed that it's for the total number of plays over the entire group membership? perhaps the stats were delayed?

[quote][b][user]jk-[/user][/b] said: So, the charts work like this: [url=http://www.last.fm/user/faxed/]faxed[/url], our fearless last.fm Canberra group leader, goes to the CD store and asks for the 15 CDs that have been on the shelves for the longest. You know, the type that are in prominent display next to the "20 polka hits of 1984" and "elevator classics" albums, below the poster of the latest Home and Away tie-in CD. Then, because his job at the corn factory doesn't pay him much, he has to run out of the store without paying for the CDs. This is usually followed by a 5-minute faxed-gets-chased-by-security-guards event, but he almost always makes it out safely. We're all trying to forget about that time that he didn't. He then takes the CDs to his loungeroom, and lays them out in a 5-by-3 grid. Standing to one side, he'll fill his mouth with as many potato crisps as is possible. One of his flatmates is charged with the task of punching him squarely in the abdomen, causing the chips to burst out and scatter all over the CDs. The album with the most chips on it goes at number one on the charts, the CD with the next-highest chip density will go at second, and so forth. He'll then patiently clean up the mess of CDs and potato crisps, in order to do the same task next week. So there you go. But somewhat more seriously: I had assumed that it's for the total number of plays over the entire group membership? perhaps the stats were delayed?[/quote]

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- [Deleted user] said...
- User
- 1 Mar 2006, 01:01
Elementary my dear Watson

I'm sure it's a derivative of this rather basic formula:

The score of query q for document d is defined in terms of these methods as follows:
score(q,d) =
Σ ( tf(t in d) * idf(t)² * getBoost(t in q) * getBoost(t.field in d) * lengthNorm(t.field in d) ) * coord(q,d) * queryNorm(sumOfSqaredWeights)
t in q

where
sumOfSqaredWeights =
Σ ( idf(t) * getBoost(t in q) )²
t in q

Note that the above formula is motivated by the cosine-distance or dot-product between document and query vector.

Having said that, I suspect that the numbers shown are the number of group members who listened to that artist in the given week, rather than the number of tracks, or some kind of similar derivative.

[quote][b][user][/user][/b] said: I'm sure it's a derivative of this rather [b]basic[/b] formula: The score of query q for document d is defined in terms of these methods as follows: score(q,d) = Σ ( tf(t in d) * idf(t)[sup]2[/sup] * getBoost(t in q) * getBoost(t.field in d) * lengthNorm(t.field in d) ) * coord(q,d) * queryNorm(sumOfSqaredWeights) t in q where sumOfSqaredWeights = Σ ( idf(t) * getBoost(t in q) )[sup]2[/sup] t in q Note that the above formula is motivated by the cosine-distance or dot-product between document and query vector. Having said that, I suspect that the numbers shown are the number of group members who listened to that artist in the given week, rather than the number of tracks, or some kind of similar derivative.[/quote]

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- glassandahalf said...
- User
- 27 Jun 2006, 05:14
Re: How do the charts work?

Quoth graceless:
Do the numbers attached to the charts within the community refer to the number of members that listened to a specific artist rather than how many times it was listened to?

Yeah thats spot on - its so that obsessive fans listening to 10000 tool songs cant rig the charts

[quote][b][user]glassandahalf[/user][/b] said: [quote][b]Quoth [user]graceless[/user][/b]: Do the numbers attached to the charts within the community refer to the number of members that listened to a specific artist rather than how many times it was listened to? [/quote] Yeah thats spot on - its so that obsessive fans listening to 10000 tool songs cant rig the charts [/quote]

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- naiTwish said...
- User
- 31 Aug 2008, 04:00
I'm guessing that it cuts out bands only listened to by one member then? Well, that's just sad - am I the only person using last.fm in Canberra that listens to Sonata Arctica?

[quote][b][user]naiTwish[/user][/b] said: I'm guessing that it cuts out bands only listened to by one member then? Well, that's just sad - am I the only person using last.fm in Canberra that listens to Sonata Arctica?[/quote]

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- SSDancontrol said...
- User
- 5 Jan 2009, 04:35
naiTwish said:
I'm guessing that it cuts out bands only listened to by one member then? Well, that's just sad - am I the only person using last.fm in Canberra that listens to Sonata Arctica?

hope so, because they are pretty woeful

[quote][b][user]SSDancontrol[/user][/b] said: [quote][b][user]naiTwish[/user][/b] said: I'm guessing that it cuts out bands only listened to by one member then? Well, that's just sad - am I the only person using last.fm in Canberra that listens to Sonata Arctica?[/quote] hope so, because they are pretty woeful[/quote]

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- Kingzy said...
- Subscriber
- 12 Aug 2009, 21:55
naiTwish said:
I'm guessing that it cuts out bands only listened to by one member then? Well, that's just sad - am I the only person using last.fm in Canberra that listens to Sonata Arctica?

No, I do too.
And as glass pointed out, it's the number of users listening to the same band.

[quote][b][user]Kingzy[/user][/b] said: [quote][b][user]naiTwish[/user][/b] said: I'm guessing that it cuts out bands only listened to by one member then? Well, that's just sad - am I the only person using last.fm in Canberra that listens to Sonata Arctica?[/quote] No, I do too. And as glass pointed out, it's the number of users listening to the same band.[/quote]

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How do the charts work?

How do the charts work?

Elementary my dear Watson

Re: How do the charts work?