2
votes
1answer
16 views

Looking to assign percentage contribution among 4 variables in a simple equation

I have a seemingly simple problem, that is giving me some trouble in solving. I have a 4 variable equation and want to determine the contribution of each variable in moving the dependent variable from ...
1
vote
1answer
108 views

The golden ratio in statistics of literature

Let a book, for example, or a poem... It consists in words and letters and symbols like : ;,!... Let $W_b$=the number of words of the book. Let $L_b$=the number of letters of the book. The number ...
24
votes
2answers
285 views

Statistics Primer for the Unwary Mathematician

I have a new position in a biology department (after being housed in a maths department) working on cognitive and population modeling. People in my lab are asking for help with applying statistical ...
0
votes
2answers
240 views

How to find (and plot) a probability distribution function?

I'm working on my biometrics course, and I have to plot a pdf (I think it means probability density / distribution function). Here is a sample pdf graph : Introduction to Biometrics page 5 , figure ...
1
vote
0answers
24 views

How to find a function that can approximate another blackbox function programmaticly?

This question has been posted on http://stackoverflow.com/questions/21758016/how-to-find-a-function-that-can-approximate-another-blackbox-function-programmat I was suggested to post it here. I ...
1
vote
1answer
37 views

Transformations problem

$$ \mbox{Let}\ x\ \mbox{have pdf}\quad {\rm f}\left(x\right) = {n \choose x}p^{x}\left(1 - p\right)^{n-x} $$ for $x = 0,1,2,\ldots,n$ where $n$ is positive integer constant and $0 < p < 1$ is ...
10
votes
2answers
237 views

Does variance do any good to gambling game makers?

People always like to evaluate the variance, but is there any way for variance to be interesting to the gambling game makers? In another word, what is a pratical gambling game that involving some ...
0
votes
1answer
86 views

When does variance fail to meet its purpose in mathematical statistics? [closed]

It have shown in a lot of both math and statistics book, however, When the books define the variance, it doesn't give much attention to math based theoretical background, i wonder if some formula that ...
1
vote
2answers
86 views

Standard Normal Distribution to Normal Distribution

Given function f() which returns a random value from a standard normal distribution, is it possible to define a function g(mu, sigma) which returns a random value from a normal distribution with a ...
2
votes
1answer
69 views

Sampling labeled items on a conveyor belts

I have items on a moving conveyor belt. Every item has a label with a number that goes from $1$ to $N$; on the conveyor belt there are more than $N$ items. I have a camera above the items on the belt, ...
0
votes
1answer
74 views

Mean of a practical distribution

I have a graph with an asymmetrical distribution (spectral response for some sensor). The graph is plotted as efficiency values versus vavelength. I must determine the median wavelength. Help please, ...
2
votes
1answer
79 views

Given enough DNA samples, would it be possible to reconstruct the entire genealogy tree of humanity? [closed]

DNA samples of live individuals. It would be more of a mesh/graph than a tree but you get what I mean. I guess we could only have access to potential graphs with varying degrees of probability. In ...
3
votes
1answer
227 views

dynamic mean: measurement of randomly distributed events

Aim is to estimate an error on a stochastic event rate. I read out the event counter second-wise, every black $1$ is a counted event (new events over time, see the plot below). During the measurement ...
1
vote
1answer
90 views

Risk process in Insurance

Let $R(t) = u + ct - \sum_{k=1}^{X(t)}Z_{k}, t\geq 0 $, be a risk process, where $u> 0$ is the initial capital of the insurance company and $c> 0$ is a premium rate. We know that the number of ...
1
vote
0answers
58 views

Who uses R with multicore, SNOW or CUDA package for resource intense computing?

who of you in this forum uses R (http://www.r-project.org/) with the multicore, SNOW or CUDA packages, so for advanced calculations that need more power than a workstation CPU? On which hardware do ...
2
votes
3answers
2k views

Probability concerning unfair dice with N sides

Fair warning: I am not a math expert (that's why I'm here). I would like to be able to calculate the probability of rolling a certain side on a die with n sides where any number of those sides has an ...
19
votes
1answer
2k views

StarCraft II: Ladder math

At the Blizzcon 2010, StarCraft II multiplayer panel, this stuff was supposed to explain the ladder matchmaking system. I look at this and go eh? what!? Is any of this real? or are they just ...
12
votes
5answers
2k views

Why does Benford's Law (or Zipf's Law) hold?

Both Benford's Law (if you take a list of values, the distribution of the most significant digit is rougly proportional to the logarithm of the digit) and Zipf's Law (given a corpus of natural ...
29
votes
10answers
2k views

Real life usage of Benford's Law

I recently discovered Benford's Law. I find it very fascinating. I'm wondering what are some of the real life uses of Benford's law. Specific examples would be great.