Randomness is the lack of pattern or predictability in events. Randomness is often modeled with probability distributions, but can also be generated by deterministic processes.
Questions tagged [randomness]
223 questions
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Sanity check to determine if 'random' data on disk drive may have been tampered with
I've got some code that does a Dept of Defense secure erase of disks,
and would like to know about a good sanity check to run after the fact.
Bottom line, the last write phase of a secure erase of a HDD is to write random
data on every byte on the…
DavidL
- 41
3
votes
2 answers
Co-occurance problem
I have a series of discrete, purportedly random whole numbers like this:
v1 v2 v3 v4 v5 v6
42 23 10 07 01 35
05 02 26 25 49 18
35 18 43 29 26 28
36 59 26 15 34 35
I want to identify if there are any values that…
Patrick
- 1,571
2
votes
2 answers
NIST Randomness Test, Testu01, Dieharder
the NIST Randomness Test, Testu01, Dieharder all seem to offer a suite of tests to check psuedo random number generators(PRNG) for randomness.
I was hoping someone with experience of those tools could tell me if they require the PRNG you want to…
Rob
- 49
2
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0 answers
Testing for randomness of room assignments
I have data on room assignments for students at a university, as well as certain characteristics on the students in the rooms, e.g. test scores, gpa, nationality, gender. I am told room assignments are random, but how can I test this? My thinking is…
Eric
- 21
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vote
1 answer
Detecting/analyzing non-random permutations of a random sequence
I am looking for theoretical results regarding how easy it is to detect alteration of a random sequence.
The permutation I am most interested in is where a subsequence of the random numbers is sorted, or permuted based on values. The random numbers…
user239558
- 113
1
vote
2 answers
But what is a random experiment
I am currently thinking a lot about the definition of probability and one thing that I am really not content with at all is the frequentist definition of probability as long run relative frequencies of "the same" random experiment, with which I mean…
Sebastian
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What do we mean by "Random" in the science's context
What do we mean by 'Random' in the science's context. Especially in the statistics and signals processing field. I looked to the dictionary definition of Random and this is what I found:
Made, done, happening, or chosen without method or conscious…
hbak
- 455
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0 answers
How can I test if a string on distinct numbers/characters is random?
Let's say I have a string of 26 letters. I want to permute them and then test if my permutation is random. How do I do this?
James D
- 11
1
vote
0 answers
testing randomness in a grid
I need help with figuring out what kind of statistics I need to run to test for randomness in a grid for small mammal trapping.
The grid consists on 64 traps, arranged in 8 rows of 8. The image attached shows an example of the grid and the red Xs…
Ashley
- 11
1
vote
1 answer
how a random sample differ from the whole population in confidence interval?
I know what confidence interval mean in random sampling, but I'm confused what does CI mean in the whole population. Is there any difference? Or I could see the whole population as a "big" random sample since the random sample is equally useful as…
Jason
- 13
0
votes
1 answer
Unsupervised learning problem: rate individual survey submissions on randomness of data entered
For my work we collect a lot of surveys which contain a mix of questions: multiple choice, checkbox and numeric. We know that in some instances enumerators might fudge the survey by entering answers at random. We also know that for the majority of…
R. Myers
- 1
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Test for Randomness
suppose a quality control supervisor at a paint manufacturing company suspects that the weights of paint cans on the production line are not varying in a random way, as she would expect. Instead, she suspects that the weights are either trending…
whoisit
- 737