Correlation Definition and 370 Threads

Hi I am i new member, i hope i am posting in the correct forum. I require some help i with a problem i am trying to solve in my work. Currently we have 3 separate leak test methods specified for a part all with different working gases and pressures. If possible, i would like to correlate this...

Hi I am i new member, i hope i am posting in the correct forum. I require some help i with a problem i am trying to solve in my work. Currently we have 3 separate leak test methods specified for a part all with different working gases and pressures. If possible, i would like to correlate this...

Homework Statement 1D polymer, fixed segment length a If the angle between segment j and j+1 is 0, the energy is 0 If the angle is pi the energy is +2J. Compute the correlation function <s_i s_{i+n}>, where s_j = \pm 1 denotes the direction of segment j Find the persistence length Lp...

Wire "Creeping" Thin wires tend to creep (extend longer over periods of time), particulary at high temperatures. Is there a "formula" that explains this correlation of the amount of creeping with regards to temperature or other factors?

Could some one please help me with the following question. The ages and salaries (in thousands of $) of 10 employees in a firm are given below. Age - Salary 28 - 17 31 - 22 31 - 28 35 - 20 40 - 26 44 - 30 45 - 32 48 - 18 53 - 33 67 - 42 What is the...

Hi, Here's my question: Determine the correlation coefficient of the random variables X and Y if var(X)=4 and Var(Y)=2 and var(X+2Y)=15 I said let Z=X+2Y and then Var(Z)=E[Z^2]-E[Z]^2 Then I multiplied the thing out: 15=Var(z)=E[X^2]+4E[XY]+4E[Y^2]-E[X]-2E[Y] I know that...

I am trying to find a pattern between male and female concerns in this survey.

Hi, I was just wondering about spearman's rank correlation coefficient hypothesis tests - for these to be valid does the data in the sample have to be drawn from a bivariate normal distribution or does that only apply to the product moment correlation coefficient? Cheers, Just some guy

The question basically states write a brief overview of the correlation between the properties and uses for copper, iron, aluminium and zinc. Now I know this sounds like a simple research task, it's supposed to relate to periodic trends and their placing on the table. It's in this area that...

A computer program, MicroLab, deals with finding the best fit curve, or allowing for linear regression of the first, second, and third orders, of a given set of data (particularly modeling nonlinear data). I am trying to stimulate this analysis on a graphing calculator (i.e., TI-83 Plus and...

Hello All, I am trying to look at some correlation numbers and while I am aware that correlation does not always indicate causality can a correlation coeffiecent that is very near to zero be used to indicate that it is not a cause? Thanks C

In a sample of 21 observations obtained it was found that sales and price have an inverse relationship and coefficient of determination is 106% as much as the adjusted coefficient of determination. It is also known that the variance of sales around mean is 640. What is the coefficient of...

Hi all. Suppose I am increasing the flow rate of the water through a sprinkler or a tube, there should be some vibration induced by this increment of flow rate, right? On the other hand, if I decrease the flow rate of the water through the same sprinker, there should also be vibration induced...

This is the equation for the Rank Correlation Coefficient: 1- \frac {6 \sum d^2} {n(n^2-1)} can anyone explain the 6? why a six? i don't see the link.

Now how exactly did Pearson derive his correlation coefficient?

Hi, Have just been reading a paper which talks about a 'height-height correlation function' of a surface. Doesn't provide any equations, but as far as I can make out it seems to be a way of reducing the topography of the surface to a small number of characteristic parameters, which makes sense...

Hi, I'm having problems with this quantum mechanics problem. This is from a practice final I found online somewhere. A particle of spin S has either spin S=0 or spin S=1. It decays into two electrons, and the spin of the two electrons is that of the original particle. The electrons come out...

When you move through space time slows down, this is part of special relativity right. Hence when Light is moving at 670 million miles a hour time stops, and if you were to try and fly a spacecraft at 335 million miles an hour time would slow down by 1/2. But what I want to know is, since we...

Do polarization cross-sections from opposite microwave background n-poles disobey the Bell inequality?

I have got a bit of problem here. I have got 4 sets of results for a biology experiment, and I want to find the correlation between them. So I read about Spearman's rank coefficient but it only works for two sets of results. Can somebody help please?