Formula for Rating Songs

[Kingdaro]

Sorry I'm kinda new to posting things that aren't about simfiles, if this is in the wrong section if you can please move it for me? Thanks.

Anyway I've been trying to come up with a good way to rate my simfiles and I may or may not have found something reasonable.

Try taking the song's note per second rate, (which can be gained via dividing the amount of notes by the song's time from the beginning of the song to the last note) and multiplying it by two. I just tested it with my "Call Upon the Sea Ponies" simfile and "Art of the Dress" simfiles and they were both rated eleven, very accurately. It seems though that some of the higher difficulty songs are rated more inaccurately, 12 Bar Bloops gaining a 15 using this system, when I rated it a 13.

Not sure if this has been thought up before, but it works pretty well for songs that are in the moderate challenge level but if there too easy or hard it just falls out of balance. I'll still probably use this system in the future for myself with a few modifications to the formula.

[Schlagwerk]

Using an average steps/sec is a decent base for rating barring gimmicks. Otherwise, you have to trust your gut-er, feet.

[SM MaxX]

It's all subjective really.
I've seen a quick guide by Kyzentun but I'm far too lazy to go search for it.

[Gazebo]

Just find a chart of similar difficulty and rate it the same

[TYLR]

You can't rate purely based on notes per second. If you did, groove DJ would be a 23 and Moonearth would only be a 12. You also have to consider how technically difficult the song is. Bloodrush is obviously harder than Xuxa, for instance, despite being slower. Crossovers, foot switches, funky rhythms, mines, gimmicks, tell jumps, jacks, etc all affect the difficulty. Just compare the song to other songs to judge the difficulty. If it's a straightforward file, 2:00 long, compare it to other straightforward, 2:00 songs. If it's a crazy technical turnfest, compare it to other crazy technical turnfests. If it's a 5:00 stamina song, compare it to 5:00 stamina songs.

[SteveReen]

Another reason a formula doesn't exactly work with our current scale is that the numbers from 1-19 are completely arbitrary -- they aren't based on any numerical value of anything in the chart at all. So any formula based on notes per second that gave you a number equivalent to the scale we use would be coincidental. The only possible way a formula would work is to have the entire formula go through a function that scales it from 1-19 or 1-20. And even then, as Tyler pointed out, we'd have to take into account tons of crazy variables such as candles, crossovers, jumps, etc etc. Bottom line is it's too complicated to try and make a purely mathematical scale; the way we do it now by just "feeling" how hard it is works well enough.

[TYLR]

I think it'd be really cool if MAX 600 worked out to be a 20-block chart. Considering it's twice as fast as the 10-block MAX 300, it'd kind of say, "hey guys, you did a pretty good job with keeping your ITG rating scale consistent."

[mudkyp]

Candles and turnnsssss

[NotChaosUnown]

If a cmod is used then the difficulty is bumped down by one or two feet.

[Xythar]

What are these feet of which you speak