What is the formula that determines whether you’re able to run from wild Pokémon after Gen 4?

Question

This question and the answer’s source doesn’t have formulas for beyond Gen 4. Does anyone know these formulas? Also, make sure to include the formula for Gen 5 double battles if it’s any different.

Comments

thought it was if your lead was faster?

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Yeah that's what it is

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If your Pokemon is slower, you will sometimes escape but other times you won't. There's definitely more to it than that.

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https://www.serebii.net/games/escape.shtml#wild
Serebii says that the formula is Probability = (((UserSpeed * 32)/ (OpponentSpeed / 4))+ 30 * AttemptNumber) / 256
I'd assume that it's for Generation 6, as that's what all of the screenshots on the pages seem to be from.