Here is a link to a working version of the spreadsheet. docs.google.com/spreadsheets/d/0B1IXOAy9WHmQRVRuaVJHMGN2cnM/htmlview?resourcekey=0-V86IVvvA6kcPUPhtE79rGA
I’ve always done the saltwater test.. fill a glass with water and add salt till the die floats. Then as long as one number doesn’t always appear on top when you jab it with your finger to make it spin, you should be great. Great video.
Old post I know but worth saying: The issue with that methood is any small air bubbles inside can create a side that will always be more boyant than another. Some of the cheep injection mold dice you can find at say target and what not roll just fine but some can have an air bubble that while don't effect the balance, does effect it when placed in water. So the sault water methood has been debunked long ago as not a proper means to check for balance. The only real way is acually rolling the dice and using tools to see if any one side likes to pop up more than others. I've had some of my own made dice pass the roll test, even after 500 rolls shows it's balanced, but in water have it fail as you can see some of the halo flakes caused a few small air bubbles that the presure pot failed to remove fully and thus, that one side tends to float up more than others, yet it don't effect the real balance of the dice.
The roll rate of unique faces of a die come up the same as the time rate of radioactive atoms decay in a sample of radioactive material. So, for example, if you roll a 20 sided die 20 times then the expectation is that 20(1-e^-(20/20)) or 20(1-e^-1)=12.6 or about 13 unique sides will show (decay) in 20 throws of said die. If you roll that same die 60 times the expectation is that 19 sides will show ie 20(1-e^-3)=19. Then using Excel for example, x,y plot the expected number of unique faces that show against the actual number of unique faces that show for 60 throws. Do this plot roll by roll. Then do a first order (linear) curve fit to the data with intercept set to zero. Let the slope of said curve fit be the judge of the die. I would think that a slope of 0.98 to 1.02 would indicate a fair die.
Good video but I kinda feel the need to add something onto here... This test is based on the null hypothesis of statistics which can never prove something is correct, it is just a test to say that something is wrong. In other words this that only proves that if you are outside the 5% boundary that they are weighted, if you are within it doesn't prove anything... Also this is, as always with chance, only 100% reliable in infinity. But on the other hand shiny click clack rocks look amazing so who cares
it's my understanding you need 100 rolls per face at a minimum, so for 20 sided dice you need 2000 rolls at a minimum for something like 95% confudence. with 200 roles you'd only have a low chance, like 20% of detecting problem
200 rolls seems like an incredibly small sample size, it would be easy to get a "streak' in just 200 rolls that would totally skew results. A few thousand rolls and I would start to believe the results...
@@ImagiNationLabswithRevChumley hehe I won't roll at all - I do the salt water test it's WAY more reliable, and you can do it in about 5 minutes, but I do think this thing is cool :)
I use the same spreadsheet, and I can confirm. Dice that are still "balanced" at 200 rolls quickly become unbalanced at 1000, 2500 or 5000. The best way of testing dice is setting them on an auto roller and having a camera capture the face number and automatically adding it to the tally. That way I can just do rolls over night. Still working on a way to make it work for more then one dice at a time based on color.
Video Title: Easy way for testing your dice for balance! The Way: role the dice enough times each and record the result to then apply some statistics. Sorry but -> Facepalm
Here is a link to a working version of the spreadsheet. docs.google.com/spreadsheets/d/0B1IXOAy9WHmQRVRuaVJHMGN2cnM/htmlview?resourcekey=0-V86IVvvA6kcPUPhtE79rGA
Saw this in the subreddit and had no idea it was yours! keep up the good work these are awesome art dice
Thank you so much 😀
But are they balanced?! (Found you on Etsy tonight. Love your dice! Can't wait to buy some!)
Hopefully I'll have some more stuff up on the shop soon. Got burned out a bit and taking a break and working on ideas for new stuff.
I’ve always done the saltwater test.. fill a glass with water and add salt till the die floats. Then as long as one number doesn’t always appear on top when you jab it with your finger to make it spin, you should be great. Great video.
Old post I know but worth saying: The issue with that methood is any small air bubbles inside can create a side that will always be more boyant than another. Some of the cheep injection mold dice you can find at say target and what not roll just fine but some can have an air bubble that while don't effect the balance, does effect it when placed in water. So the sault water methood has been debunked long ago as not a proper means to check for balance. The only real way is acually rolling the dice and using tools to see if any one side likes to pop up more than others. I've had some of my own made dice pass the roll test, even after 500 rolls shows it's balanced, but in water have it fail as you can see some of the halo flakes caused a few small air bubbles that the presure pot failed to remove fully and thus, that one side tends to float up more than others, yet it don't effect the real balance of the dice.
The roll rate of unique faces of a die come up the same as the time rate of radioactive atoms decay in a sample of radioactive material. So, for example, if you roll a 20 sided die 20 times then the expectation is that 20(1-e^-(20/20)) or 20(1-e^-1)=12.6 or about 13 unique sides will show (decay) in 20 throws of said die. If you roll that same die 60 times the expectation is that 19 sides will show ie 20(1-e^-3)=19. Then using Excel for example, x,y plot the expected number of unique faces that show against the actual number of unique faces that show for 60 throws. Do this plot roll by roll. Then do a first order (linear) curve fit to the data with intercept set to zero. Let the slope of said curve fit be the judge of the die. I would think that a slope of 0.98 to 1.02 would indicate a fair die.
Says I need to request access to the document :/
I’ve tried downloading the spreadsheet, but haven’t been successful. I’m probably just an idiot.😄 Any help?
But can you use this in google sheets
Good video but I kinda feel the need to add something onto here... This test is based on the null hypothesis of statistics which can never prove something is correct, it is just a test to say that something is wrong. In other words this that only proves that if you are outside the 5% boundary that they are weighted, if you are within it doesn't prove anything... Also this is, as always with chance, only 100% reliable in infinity. But on the other hand shiny click clack rocks look amazing so who cares
I fail to reject this comment. :)
i dont thing that i could do the salt water test with metal dice tho
My dice are far from balanced.
it's my understanding you need 100 rolls per face at a minimum, so for 20 sided dice you need 2000 rolls at a minimum for something like 95% confudence. with 200 roles you'd only have a low chance, like 20% of detecting problem
200 rolls seems like an incredibly small sample size, it would be easy to get a "streak' in just 200 rolls that would totally skew results. A few thousand rolls and I would start to believe the results...
Feel free to roll your dice a couple thousand times, 5000 rolls is max entry for the spreadsheet.
@@ImagiNationLabswithRevChumley hehe I won't roll at all - I do the salt water test it's WAY more reliable, and you can do it in about 5 minutes, but I do think this thing is cool :)
I use the same spreadsheet, and I can confirm. Dice that are still "balanced" at 200 rolls quickly become unbalanced at 1000, 2500 or 5000. The best way of testing dice is setting them on an auto roller and having a camera capture the face number and automatically adding it to the tally. That way I can just do rolls over night. Still working on a way to make it work for more then one dice at a time based on color.
Video Title: Easy way for testing your dice for balance!
The Way: role the dice enough times each and record the result to then apply some statistics. Sorry but -> Facepalm