General question: is a d100 statistically the same thing as 2d10?

By Rookhelm, in Star Wars: Edge of the Empire RPG

A lot of d100 rolls can be made during EotE. We just use a single d10 and roll it twice (first number is tens, second number is ones).

My question is, is this statistically equivalent to rolling a big ass d100? Or even 2 d10s at the same time?

I'm thinking it is, but stats are not my strong suit.

Edited by Rookhelm

I think that's what most people do. When most systems call fora D100, it's really 2 10's. If you buy a D&D/Pathfinder dice set, they usually come with 2 ten siders. One usually has a zero after the first number to represent 10's. It's much more practical.

Statistically it should be the same.

Edited by Split Light

And if your results fall neatly into increments of 5%, you can even just roll a d20!

:)

And if your results fall neatly into increments of 5%, you can even just roll a d20!

:)

*mind blown*

I mean, mathematically speaking, that's obvious...but I never thought about using a d20 for a crit/obligation table

I mean, mathematically speaking, that's obvious...but I never thought about using a d20 for a crit/obligation table

Or, for that matter, why is the fundamental unit of XP in this game 5 instead of just 1?

This is an issue that bugs me everywhere and all the time -- did math teachers abruptly curtail teaching Greatest Common Factors?

It's completely equivalent to rolling a d100 if you are using two d10's as percentile dice and not adding them together which is something completely different.

And if your results fall neatly into increments of 5%, you can even just roll a d20!

:)

*mind blown*

I mean, mathematically speaking, that's obvious...but I never thought about using a d20 for a crit/obligation table

There are lots of wierd combo's that work. Long ago when playing 1st Edition D&D and coming up short of d20's, we actually used a d10 and a d6 in its place - the d6 determined if you put a 0 (rolled a 1-3) or a 1 (rolled 4-6) before the number on the d10. A 00 meant you rolled a 20. Not elegant, but it worked.

Edited by Sturn

Most people don't use a D100 cause the dang things never stop rolling

Most people don't use a D100 cause the dang things never stop rolling

The best use I've ever found for an actual d100 die is as a Trade Federation battleship token during a starship combat.

I mean, mathematically speaking, that's obvious...but I never thought about using a d20 for a crit/obligation table

Or, for that matter, why is the fundamental unit of XP in this game 5 instead of just 1?

This is an issue that bugs me everywhere and all the time -- did math teachers abruptly curtail teaching Greatest Common Factors?

I think it's because, for most people, thinking in chunks of five makes the perception of cost and value easier to see than doing it more incrementally.

I'm sure there's a psychological explanation for it, but the progression and of 5-10-15-20 feels 'neater' and more, like, number-friendly (?) than just straight up 1-2-3-4.

I mean, mathematically speaking, that's obvious...but I never thought about using a d20 for a crit/obligation table

Or, for that matter, why is the fundamental unit of XP in this game 5 instead of just 1?

This is an issue that bugs me everywhere and all the time -- did math teachers abruptly curtail teaching Greatest Common Factors?

I think it's because, for most people, thinking in chunks of five makes the perception of cost and value easier to see than doing it more incrementally.

I'm sure there's a psychological explanation for it, but the progression and of 5-10-15-20 feels 'neater' and more, like, number-friendly (?) than just straight up 1-2-3-4.

agreed, i'm sure it has more of a phsychological impact than a mathematical one. Most games could theoretically be whittled down to ones and twos, but throwing out bigger numbers (even if, from a ratio perspective, there's no difference) feels more substantial.

I think that's what most people do. When most systems call fora D100, it's really 2 10's. If you buy a D&D/Pathfinder dice set, they usually come with 2 ten siders. One usually has a zero after the first number to represent 10's. It's much more practical.

Statistically it should be the same.

Just remember that the 10's dice is for the 10's digit only. so if you roll a 00 0 that it is 100, (10) (0) = 10, (20) (0) = 20, etc. i knew a guy who would roll (10) (0) and think that it was 100 and would get confused if he rolled (00) (0)

People like bigger numbers. Bigger numbers means more. (<not true, but there you go)

I mean obviously if I have 1000 hitpoints and stormies average about 275 a hit, it's of course better that if I had 10 and they only did 2. Could you really see a Stormtrooper doing 2 damage?????

*For the love of the gods please note the sarcasm*

That and I dont believe d100 have "real" as in regular sides. Just a sphere with parts cut out of it. golf balls are better.

Statistically it is not the same for the purpose of generating an effect.

On a 1d100( 00-99 ). Most dice are designed that each opposing side adds to the same sum.

on a d6, all opposing sides will be the sum of 7. My d100 broke so I don't know the sum I think it's 99. This means that apx 50 and 49 are probably on the opposing side of each to make sure there is a more random variance in physical space of all numbers near each other.

Where as on a 2d10, your major determination of your effect is only on a d10. which has no chance of resulting on the opposing side of the result. Once you have your d10 you have already done most of the determination. The second d10 only results in a binary result of high/low.

In Star wars here, all values of use are increments of 5 anyway. making a 2d10 less effective for randomization than just a plain d20. Where as the d20 would represent a better spread of odds.

I do often use 2d10, but after this discussion I might switch to a d20 :D

Though I would throw in a couple of images

http://milsims.cdn.kept.com.au/sites/milsims.com.au/files/imagecache/product_full/prodimg/img9596.jpg

http://www.lonslair.com/images/Opaque%20d100%20Poly%20White%20with%20Blue%20Die.jpg

as can be seen if you roll 100, there is still physically near by the odd of 36. Which is a 30 on 2d10

Edited by .jayderyu

Or, for that matter, why is the fundamental unit of XP in this game 5 instead of just 1?

This is an issue that bugs me everywhere and all the time -- did math teachers abruptly curtail teaching Greatest Common Factors?

I always figured it was so that the GM could hand out small 1-2xp awards for individual roleplay things instead of having to hand out the equivalent of a starting level talent every time he wants to award something.

Um...can we stop using the term 2d10 for rolling percentile with two d10s? Please?

2d10 refers to rolling two ten sided dice simultaneously and adding them together to create a total.

This incorrect nomenclature is going to cause havoc when you speak to most other gamers or discuss probabilities. I don't meant to be a tool, so hopefully this doesn't come across that way. Just trying to save my sanity as I almost started discussing the bell curve that appears with 2+ d10s added together versus a single percentile roll.

Statistically as long as the dice are equally weighted and there is nothing funky going on, rolling a 1-100 through any means you wish is exactly the same (physics of the individual dice formation aside).

Whatever Jayderyu was talking about, is honestly just nonsensical :) We aren't talking averages, we are talking ranges.

1d100

2d10 for 00-99

2d20 taking the least significant digit for 00-99

etc. All exactly the same.

Edited by Valdier

There are d10s out there with markings like 00, 10, 20, 30, 40, etc. Its also in FFGs SW dice app. I use that paired with a normal d10 for d100 rolls.

Most people don't use a D100 cause the dang things never stop rolling

The best use I've ever found for an actual d100 die is as a Trade Federation battleship token during a starship combat.

Ever try playing a round of golf with one? ;)

Or, for that matter, why is the fundamental unit of XP in this game 5 instead of just 1?

This is an issue that bugs me everywhere and all the time -- did math teachers abruptly curtail teaching Greatest Common Factors?

I always figured it was so that the GM could hand out small 1-2xp awards for individual roleplay things instead of having to hand out the equivalent of a starting level talent every time he wants to award something.

I've done that. And for playing one's motivation, but not doing so well nor convincingly (made a token effort at it).

I think that's what most people do. When most systems call fora D100, it's really 2 10's. If you buy a D&D/Pathfinder dice set, they usually come with 2 ten siders. One usually has a zero after the first number to represent 10's. It's much more practical.

Statistically it should be the same.

Just remember that the 10's dice is for the 10's digit only. so if you roll a 00 0 that it is 100, (10) (0) = 10, (20) (0) = 20, etc. i knew a guy who would roll (10) (0) and think that it was 100 and would get confused if he rolled (00) (0)

How often did he roll d100's???

Um...can we stop using the term 2d10 for rolling percentile with two d10s? Please?

2d10 refers to rolling two ten sided dice simultaneously and adding them together to create a total.

This incorrect nomenclature is going to cause havoc when you speak to most other gamers or discuss probabilities. I don't meant to be a tool, so hopefully this doesn't come across that way. Just trying to save my sanity as I almost started discussing the bell curve that appears with 2+ d10s added together versus a single percentile roll.

This.

2d10 gives a result of 2 to 20 with a most likely result of 11

Most people don't use a D100 cause the dang things never stop rolling

The best use I've ever found for an actual d100 die is as a Trade Federation battleship token during a starship combat.

Personally the best use I have found was as a cat toy, it was a good size and had beads inside for weight so would rattle while the cat batted it around.

Or, for that matter, why is the fundamental unit of XP in this game 5 instead of just 1?

This is an issue that bugs me everywhere and all the time -- did math teachers abruptly curtail teaching Greatest Common Factors?

I always figured it was so that the GM could hand out small 1-2xp awards for individual roleplay things instead of having to hand out the equivalent of a starting level talent every time he wants to award something.

This was my impression as well. Makes it easier for GMs to hand out small amounts of XP as minor rewards during play. Sure, it won't amount to much right away, but over a few sessions it'll be enough for a first-tier talent or a rank 1 career skill.

There are d10s out there with markings like 00, 10, 20, 30, 40, etc. Its also in FFGs SW dice app. I use that paired with a normal d10 for d100 rolls.

That's what I ended up buying last night. I decided a single d100 was too bulky and unwieldy (and slow to stop), so I got percentile dice. One a regular d10 and one with 00,10,20, etc on it.

I think I like that the best.

I think that's what most people do. When most systems call fora D100, it's really 2 10's. If you buy a D&D/Pathfinder dice set, they usually come with 2 ten siders. One usually has a zero after the first number to represent 10's. It's much more practical.

Statistically it should be the same.

Just remember that the 10's dice is for the 10's digit only. so if you roll a 00 0 that it is 100, (10) (0) = 10, (20) (0) = 20, etc. i knew a guy who would roll (10) (0) and think that it was 100 and would get confused if he rolled (00) (0)

How often did he roll d100's???

3-4 times. I think that he would also roll (00) (1) and think it was 100. so he mistook two really good results in the WH40k system and think he failed.