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Advantage / Disadvantage in 5e
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<blockquote data-quote="Gecko85" data-source="post: 6544961" data-attributes="member: 6789257"><p>Sorry, but your math/assumptions are incorrect. There is never a "+19" benefit for advantage. Advantage is *always* the probability of hitting a specific target or higher when rolling two dice. I've already posted those probabilities. The probability is a percentage, but we can give it as an *equivalent* bonus as if we had just rolled one die because we know the odds for rolling any single number on a d20 is 5%. So, there's never more than a 25% better chance (or, the equivalent of +5) when using advantage. </p><p></p><p></p><p></p><p>Again, the assumptions are wrong. When using advantage, you roll two dice. The probability of rolling a target number or higher are based on rolling two dice, not rolling 1 die then another. There is no first die, second die. There are only both dice. Statistically, per the laws of probability, order does not matter. </p><p></p><p></p><p>It's not a matter of me being right. The math is the math. Probability is probability. It's calculable. The average equivalent benefit of advantage is +3.325 (or, about 16%). The actual benefit, though, changes depending on what your target number is. And, I'd say it's very advantageous. It's as high as 25% (for a target of 11). So, if you need to roll an 11 or higher, you have the equivalent of +5 on your roll. That's huge. Even the lowest percentage advantage (for rolling a natural 20) is double with advantage than without, even if it's still relatively small. So, again, the average equivalent advantage is +3.325, which is very advantageous. It's never 6.65, because that's not how probability works.</p></blockquote><p></p>
[QUOTE="Gecko85, post: 6544961, member: 6789257"] Sorry, but your math/assumptions are incorrect. There is never a "+19" benefit for advantage. Advantage is *always* the probability of hitting a specific target or higher when rolling two dice. I've already posted those probabilities. The probability is a percentage, but we can give it as an *equivalent* bonus as if we had just rolled one die because we know the odds for rolling any single number on a d20 is 5%. So, there's never more than a 25% better chance (or, the equivalent of +5) when using advantage. Again, the assumptions are wrong. When using advantage, you roll two dice. The probability of rolling a target number or higher are based on rolling two dice, not rolling 1 die then another. There is no first die, second die. There are only both dice. Statistically, per the laws of probability, order does not matter. It's not a matter of me being right. The math is the math. Probability is probability. It's calculable. The average equivalent benefit of advantage is +3.325 (or, about 16%). The actual benefit, though, changes depending on what your target number is. And, I'd say it's very advantageous. It's as high as 25% (for a target of 11). So, if you need to roll an 11 or higher, you have the equivalent of +5 on your roll. That's huge. Even the lowest percentage advantage (for rolling a natural 20) is double with advantage than without, even if it's still relatively small. So, again, the average equivalent advantage is +3.325, which is very advantageous. It's never 6.65, because that's not how probability works. [/QUOTE]
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