Answer by Peter O. for Why do people say there is modulo bias when using a...
Modulo reduction is a commonly seen way to make a random integer generator avoid the worst case of running forever.When the range of possible integers is unknown, however, there is no way in general to...
View ArticleAnswer by Ben Personick for Why do people say there is modulo bias when using...
Mark's Solution (The accepted solution) is Nearly Perfect.int x;do { x = rand();} while (x >= (RAND_MAX - RAND_MAX % n));x %= n;edited Mar 25 '16 at 23:16Mark Amery 39k21170211However, it has a...
View ArticleAnswer by Rivenfall for Why do people say there is modulo bias when using a...
With a RAND_MAX value of 3 (in reality it should be much higher than that but the bias would still exist) it makes sense from these calculations that there is a bias:1 % 2 = 12 % 2 = 03 % 2 =...
View ArticleAnswer by Jim Wood for Why do people say there is modulo bias when using a...
DefinitionModulo Bias is the inherent bias in using modulo arithmetic to reduce an output set to a subset of the input set. In general, a bias exists whenever the mapping between the input and output...
View ArticleAnswer by Yavuz Koroglu for Why do people say there is modulo bias when using...
I just wrote a code for Von Neumann's Unbiased Coin Flip Method, that should theoretically eliminate any bias in the random number generation process. More info can be found at...
View ArticleAnswer by Rob Napier for Why do people say there is modulo bias when using a...
@user1413793 is correct about the problem. I'm not going to discuss that further, except to make one point: yes, for small values of n and large values of RAND_MAX, the modulo bias can be very small....
View ArticleAnswer by bobobobo for Why do people say there is modulo bias when using a...
As the accepted answer indicates, "modulo bias" has its roots in the low value of RAND_MAX. He uses an extremely small value of RAND_MAX (10) to show that if RAND_MAX were 10, then you tried to...
View ArticleAnswer by AProgrammer for Why do people say there is modulo bias when using a...
There are two usual complaints with the use of modulo.one is valid for all generators. It is easier to see in a limit case. If your generator has a RAND_MAX which is 2 (that isn't compliant with the C...
View ArticleAnswer by Nick Dandoulakis for Why do people say there is modulo bias when...
Keep selecting a random is a good way to remove the bias.UpdateWe could make the code fast if we search for an x in range divisible by n.// Assumptions// rand() in [0, RAND_MAX]// n in (0, RAND_MAX]int...
View ArticleAnswer by user1413793 for Why do people say there is modulo bias when using a...
So rand() is a pseudo-random number generator which chooses a natural number between 0 and RAND_MAX, which is a constant defined in cstdlib (see this article for a general overview on rand()).Now what...
View ArticleWhy do people say there is modulo bias when using a random number generator?
I have seen this question asked a lot but never seen a true concrete answer to it. So I am going to post one here which will hopefully help people understand why exactly there is "modulo bias" when...
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