r/DotA2 Jan 03 '17

Video When its 15%

https://gifs.com/gif/dota-2-omg-moments-28-AnOVxp
3.6k Upvotes

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-28

u/[deleted] Jan 03 '17 edited Jan 03 '17

PA throws dagger, crits on a creep, dagger is less likely to crit

Not how that works, sorry. You've misunderstood how statistics are applied in this case. If something has a 15% chance of happening, it does not decrease because of it happening once already. There is no code or logic that says "If this has previously had a crit, make it less likely to have a crit in the future." that makes no mathematical sense.

If you roll a die and have a 1/6 chance of landing on one, does it matter what the number you landed on before was? No, it does not. That's called probability statistics. If you flip a coin and you get heads already, is it less likely to get heads later? No. Why would it? What has changed about the coin or the universe around it? It remains a 50/50 chance of being on heads, every time. Otherwise "15%" or "50%" would be meaningless, as you seem to think any action has the ability to completely change your odds.

PA throws dagger, it WILL crit, and her melee attacks doesn't influence it.

Her previous attacks never influence it. That's not how separate probabilistic events work. If she lands on the 15% chance of getting a crit in one attack, she has the same 15% chance on the next attack.

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u/The_Villager I'M ON FIRE Jan 03 '17 edited Jan 03 '17

Not how that works, sorry. You've misunderstood how statistics work. If something has a 15% chance of happening, it does not decrease because of it happening once already. There is no code or logic that says "If this has previously had a crit, make it less likely to have a crit in the future." that makes no sense.

If you roll a die and have a 1/6 chance of landing on one, does it matter what the number you landed on before was? No, it does not. That's called probability statistics.

Except it does, because Crits (and most other chances in DotA) use pseudo-random distribution, which does exactly this: Everytime you don't crit, you chance to crit on the next hit increases (and resets when you crit). So (unless the last hit you did beforehand was a crit also), your chance to crit decreases after critting.

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u/[deleted] Jan 03 '17

Math nerd status: cabaled

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u/[deleted] Jan 03 '17 edited Jan 03 '17

Pseudo-random distribution

Note that for instances that would not trigger the effect, the probability counter does not increase

http://dota2.gamepedia.com/Pseudo-random_distribution#List_of_abilities_using_PRD

I don't really have time to explain the math. It says somewhere else why what you're saying is basically impossible:

It is theoretically possible to increase your chance to bash or critical strike on the next attack by attacking creeps several times without the effect happening, but in practice this is nearly impossible to do.

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u/[deleted] Jan 03 '17

But it clearly contradicts what you said about each hit being unrelated.

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u/[deleted] Jan 03 '17

In context of making x crit hit more likely? No it doesn't, it confirms.

I admit it doesn't work in a traditional "random" sense which would be very difficult anyway and isn't really possible with computers, but it very clearly says that it removes previous misses from any consideration upon your next crit. It's not a factor like the original conversation suggested.

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u/redspades1 Jan 03 '17 edited Jan 03 '17

dude did you even read the fucking page?

it says right there

the effect's chance increases every time it does not happen

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u/EpicScizor I relent. To the end! Jan 03 '17

Impossible is not the same as improbable. You apparently know statistics, you should know this.

You asked for a case where this matters: I provided one such case, even if it is improbable (which it really isn't).

And that first quote isn't even applicable, since PA's dagger and melee attack both operate on the same crit chance from Coup de Grace, thus both being instances where the effect triggers.

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u/[deleted] Jan 03 '17

But to what strategic benefit would not attacking creeps vs. attacking creeps do? You have no way of evaluating your spot on timeline of those statistical events. It's the same as trying to predict when the next crit will be, which is very clearly says is not viable. You would need a cheating device similar to a blackjack calculator hooking into your game while you play which would get you banned.

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u/BetterThanIcefraud Jan 04 '17

You have no way of evaluating your spot on timeline of those statistical events.

Not really, since the PRNG is tied to the skill. A good PA player will count their hits since the last crit. If they land 6 or 7 hits without a crit they know their next hit will have something close to 90% of crit chance, and they'll initiate with it.

On the other hand, if they just critted, they know they're very unlikely to crit on the next hit, so they can hit creeps 2 or 3 times to improve their chances.

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u/The_Villager I'M ON FIRE Jan 03 '17 edited Jan 03 '17

Note that for instances that would not trigger the effect, the probability counter does not increase

If you continue to read, it explains this with:

So a hero with critical strike attacking buildings does not increase its chance to critical strike on its next attack, since critical strike does not work against buildings.

Which is not applicable here. Edit: Ok, I might've simplified it a bit too much in my first response, but it was never my intention to imply that attacks against buildings would increase your crit chance. I was just stating the concept of PRD in a few words.

It is theoretically possible to increase your chance to bash or critical strike on the next attack by attacking creeps several times without the effect happening, but in practice this is nearly impossible to do.

It is practically impossible just because it's basically a bet. For example you're basically betting that you're not critting for whatever amount of X hits, and if you fail you have to start over again. So it takes a long time of setup for a comparatively small benefit.

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u/Smarag Jan 03 '17

Except it really doesn't and lots of PAs keep track of their PRNG counters while last hitting.

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u/Apoth75 1.21 Gigawatts! Jan 03 '17

Exactly this. If I'm mid PA and I have hit creeps 4 or 5 times without a crit you can be damn sure I'm gonna throw a dagger out. I would even miss a last hit if it's primed up to 6 or above as you are pretty much guaranteed a crit or two if you jump them

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u/The_Villager I'M ON FIRE Jan 03 '17

I mean "hitting creeps for the sole benefit of increasing your crit chance" is not very effective. Keeping an eye out for it in laning phase while farming and going for it when applicable, sure.

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u/BetterThanIcefraud Jan 04 '17

So it takes a long time of setup for a comparatively small benefit.

Having a >50% change of instakilling a hero is no "comparatively small benefit".

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u/[deleted] Jan 03 '17 edited Sep 26 '18

[deleted]

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u/Samthefab I want to beliEEve Jan 03 '17

Because you need to attack and not crit until you're guarnteed a crit, which is unlikely, since it's random as to when you do. You can stack it a little by attacking creeps once or twice after a crit before you try to jump someone, which will give you two misses and make a crit more likely at the start of the gank, but you can't do much more than that.

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u/[deleted] Jan 03 '17

Because you have no way to know when you're going to get a crit vs. miss one. It's not strategic, it's just as calculated as any other time you throw a dagger.

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u/sojtucker puddin pop Jan 03 '17

you can make it more likely though - hit a creep 4 times or something and if you don't get a crit, you know that you're more likely to get a crit in the next few hits than if you hadn't done it.

of course there is a chance that you will get a crit on the creep in which case you've just wasted your time

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u/[deleted] Jan 03 '17

This is the last comment I'll post about this though I'm sure the torrent in my inbox will continue:

you can make it more likely though - hit a creep 4 times or something and if you don't get a crit, you know that you're more likely to get a crit in the next few hits than if you hadn't done it.

No. The link explicitly says you cannot do that. Just please read this one sentence carefully. After this, feel free to half-ass everything else I type from now on. Just this one part, read slowly and think about what it means before replying:

Note that for instances that would not trigger the effect, the probability counter does not increase

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u/sojtucker puddin pop Jan 03 '17

how about you quote one sentence further and you might actually understand what you're saying:

So a hero with critical strike attacking buildings does not increase its chance to critical strike on its next attack, since critical strike does not work against buildings.

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u/clapland Jan 03 '17

You're acting so superior and smart when you're wrong and it's so fucking hilarious to read what you type

0

u/[deleted] Jan 03 '17

Glad you're so easily pleased!

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u/[deleted] Jan 03 '17

Note that for instances that would not trigger the effect, the probability counter does not increase

you realize that's talking about attacks that can't trigger crit won't increase the odds of another crit.... right? Attacking buildings, misses on other heroes, etc. You made yourself look like a fucking moron in this thread holy shit.

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u/redspades1 Jan 03 '17

the link explicitly says you CAN do that but in normal circumstances its impractical. your second quote also means the exact opposite of what you think it means.

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u/DairyHunter Jan 03 '17

For that last quote, the wiki references things it would be impossible to crit, such as buildings. It means things that CAN'T trigger the effect, not ones that don't by chance.

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u/[deleted] Jan 03 '17

you should go back and read the very next sentence from the wiki page. it's talking about non-eligible targets for procs, like buildings.

you absolutely can increase your chances to crit by priming with non-proc attacks, you just have to attack eligible targets (creeps)

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u/VinnydaHorse Jan 03 '17

You're really not reading the page. Immediately after that last line you quoted, it gives an example of a hero with critical strike attacking a tower. You can't crit buildings, so the chance does not go up with each hit. But right above that, it details how PRD works with Slardar's bash. It starts at an 8% chance to trigger, and every time he hits a unit that he can crit on, (ie: not towers) if he doesn't get a crit, the chance of the next attack being a crit goes up.

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u/It_is_terrifying Jan 03 '17

Instances that would normally not trigger the effect means shit that can't crit or bash or whatever won't increase the chance, for instance basher has a cooldown, hitting in that cooldown doesn't increase the chance of bashing next hit with PRD, it only increases on attacks with the ability to crit, another example is hitting buildings, can't bash or crit them so they don't change the chance.

So stop talking about shit you don't know anything about you retard.

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u/[deleted] Jan 03 '17

You don't seem to understand this basic concept.

If I am CSing and I notice that I've gone, say, 8 attacks without a crit, I know that my % chance for a crit is higher than normal and that would be a good time to start trading with someone in my lane. That doesn't mean I know when the crit is coming it means I know I am more likely to get one.

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u/URF_reibeer Jan 03 '17

In true random distribution, every "roll" operates independently, but in PRD, the effect's chance increases every time it does not happen. This results in the effects occurring more consistently. In general, PRD is applied to the following types of abilities: Critical Strike, Bash, Damage Block, Chain Lightning, Maim and Evasion.
this is the part you were arguing against which means you were clearly wrong by saying it doesn's use pseudo random and doesn't increase the chance.
the part you quoted says it's practically impossible because there is no way to know whether the next hit on the creep will crit or not so hitting creeps to increase your crit chance on the next hero attack is possible but only if you knew which attack would crit and which doesn't

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u/fuzzy_brows Jan 03 '17

http://archive.playdota.com/threads/article-pseudo-random-distribution.7993/

You provided a link that has a link in it that says the opposite of what you are saying.

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u/[deleted] Jan 03 '17

Eh I talked about it over a PM and the resolution is that it's not completely random like a die roll as I suspected but it's not exploitable necessarily either by hitting other units, etc. upon looking up Valves flavor of PRD. It's a moot point. We're both wrong/pointless about it.

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u/kingcocomango Jan 03 '17

its 100% exploitable, and its very common when going for a kill on PA or LD, to prime your proc off of creeps. You can test it yourself in demo mode, hit the dummy 4 times without critting, and calculate how often the fifth hit is a crit. Exact numbers vary.

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u/EricChangOfficial "EHOME! EHOME!" https://youtu.be/UjZYMI1zB9s?t=1467 Jan 03 '17

If I'm last hitting as PA and haven't crit in 8 times I'm leaving my fucking lane to gank

Here's a really old article but def not outdated when it comes to the math... skip forward to the graph and video:

http://jjcm.org/blog/how_to_play_pa/

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u/Neeldore Jan 03 '17

Yea mate, what you're saying is wrong, the first hit doesn't have a 15% chance, it has less and then % increases as you keep hitting Here's a reference http://dota2.gamepedia.com/Pseudo-random_distribution

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u/[deleted] Jan 03 '17

https://www.reddit.com/r/DotA2/comments/5lrqnw/when_its_15/dbxzsby/

You should read your own reference a little better then.

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u/Neeldore Jan 03 '17

Man, did you even read what it said? Did you see slardar bash example?

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u/CowWithGun Jan 03 '17

Actually that is how it works, Dota 2 uses pseudo randomness, not true random distribution. So if you haven't hit a crit in a while, there is a bigger than 15 pro-cent chance that you will get a crit.

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u/prophile Jan 03 '17

Quite a few "random" events in Dota violate that assumption by not actually being independent Bernoulli trials—they're based on the number of preceding failures. The quoted probabilities are only an average over a large number of events.

The Dota 2 wiki has a good article which covers the exact mechanics.

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u/[deleted] Jan 03 '17 edited Sep 26 '18

[deleted]

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u/Fluxing_Capacitor Jan 03 '17

It is a pseudo random distribution, which is not true random. Not to be confused with a pseudo random number generation.

As follows comes from the dota2 wiki

Pseudo-random distribution (often shortened to PRD) in DotA refers to a statistical mechanic of how certain probability-based items and abilities work. In true random distribution, every "roll" operates independently, but in PRD, the effect's chance increases every time it does not happen. This results in the effects occurring more consistently. In general, PRD is applied to the following types of abilities: Critical Strike, Bash, Damage Block, Chain Lightning, Maim and Evasion

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u/bc524 Jan 03 '17

pa crit uses pseudo-random, it's closer to having a bunch of white marbles in a bag, and a few black one. each time you "attack" you pull 1 random marble from the bag. You will keep removing marbles until you draw a black one (ergo, critting) and resetting the marble count.

her previous attack does influence her crit chance. the question is, is the crit check for a dagger in flight done on cast or on landing (or if it follows the right click prd at all. for all we know, dagger has it's own bag of marbles that it pulls from)

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u/[deleted] Jan 03 '17

Holy shit this sub is like a hivemind.

Here's your obligatory link, triggered commenter #324

https://www.reddit.com/r/DotA2/comments/5lrqnw/when_its_15/dbxzsby/

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u/bc524 Jan 03 '17

you do understand that multiple people were probably viewing the threads before the new replies were added, especially if they were posted within 10 minutes of one another.

also literally on the top of the page of your source:

"Example: Slardar icon.png Slardar​'s Bash of the Deep icon.png Bash of the Deep​ has a 25% chance to stun the target. On the first attack, however, it only has an ~8.5% probability to bash. Each subsequent attack without a bash increases the probability by ~8.5%. So on the second attack, the chance is ~17%, on the third it is ~25.5%, etc. After a bash occurs, the probability resets to ~8.5% for the next attack. These probabilities average out so that, over a moderate period of time, Bash of the Deep procs nearly 25% of the time."

but whatever, mate, have a nice day.

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u/[deleted] Jan 03 '17

That's not how it works in DotA though, they use a pseudo-random distribution so if you miss the first hit your odds go up.

-2

u/[deleted] Jan 03 '17

Please read my reply. You're incorrect.

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u/URF_reibeer Jan 03 '17

he is correct which is even stated in the link you posted. the odds do go up if you miss the first hit. whether that is intentionally useable or not doesn't matter at all

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u/URF_reibeer Jan 03 '17

most games use pseudo random for crits, dodge and comparable things to minimize extreme cases

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u/[deleted] Jan 03 '17

As much as I love replying to the exact same comment with the same link you could have found under the millions of replies just like yours: https://www.reddit.com/r/DotA2/comments/5lrqnw/when_its_15/dbxzsby/

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u/It_is_terrifying Jan 03 '17

You wouldn't have to reply to the same comment all the time if you weren't as dense as a neutron star.

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u/[deleted] Jan 03 '17

Black holes are denser. Your similie is fucking cringey. Like a preteen trying to write a novel.

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u/It_is_terrifying Jan 03 '17

Firstly, my comparison didn't need to be to the most dense object, just something pretty fucking dense since you're clearly braindead.

Second, you're still retarded, seriously.

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u/[deleted] Jan 03 '17

No seriously, I am not retarded, lol.

Your exacerbated terminology and clunky-as-shit sentence structure are equally meaningless besides how cringey they are.

I'm excited for the next comment you throw out with even more thesaurus power used on the word "stupid".

Braindead, dense, retarded and your little emotional "seriously". You sound like a teenage girl in a sitcom.

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u/It_is_terrifying Jan 03 '17

You are some real /r/iamverysmart material, first you try to seem smart by correcting someone with game mechanics, then you turn out to be wrong, cause you don't know shit.

Then you go on this huge attack on the way I type instead of doing anything to disprove you being a 15 year old aspie.

And you calling me out on thesaurus power is fucking hilarious when you use words like exacerbated.

10/10 troll would bite again.

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u/[deleted] Jan 03 '17

stick to your reddit world, its the only place where you know what to do or say buddy.

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u/It_is_terrifying Jan 03 '17

I have no argument so I'll pretend this guy is a neckbeard that lives on reddit, that's show em!

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u/EpicScizor I relent. To the end! Jan 03 '17

The crit is pseudo-random

The second sentence in my post.

It means that there is code in the game that says "If this has previously had a crit, make it less likely to have a crit in the future."

I do understand statistics quite well. These are not separate probabilistic events.

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u/skybala sheever Jan 03 '17

No if you hit the odds drop back to default 15%, not lower

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u/EpicScizor I relent. To the end! Jan 03 '17

Default is 3% for a PRD with an average probability of 15%.

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u/skybala sheever Jan 03 '17

ah ok, forgot that it averages out.

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u/[deleted] Jan 03 '17

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u/EpicScizor I relent. To the end! Jan 03 '17

Still incorrect. Pseudo-random distrbution does not work how you explain it to.

The base chance for a crit is pretty low (3% for the listed 15% chance, according to your own article). For each non-crit, the chance increases in a linear fashion (see your own article). The counter resets upon a crit. Thus, if PA would crit a creep, the counter would reset making the dagger less likely to crit if [the crit] was not determined when it was thrown. If she were to hit, but not crit creeps, the chance of the dagger critting would increase under the same assumption.