# Tagged Questions

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41 views

### Can non-paired data have dependency?

I have two vectors of data of different sample size. Both are the same experiment, but executed in a different environment. Since the sample sizes are different and they don't share any subject, is it ...
21 views

### Dependency between two independent experiments pointless?

Let's say I have two experiments of the same type, where I measure something x times in one location and y times in another location, is there any point in looking for a dependency in values between ...
47 views

### Total probability theorem with normal probability density functions

Let $X$ and $Y$ be two continuous random variables. Suppose that: $X$ has normal pdf with mean mu_1 and variance $\sigma_1^2$ $Y|X$ has normal pdf with mean $mu_2=(a+b*X)$ and variance $\sigma_2^2$; ...
32 views

### What is the distribution of an outer product of random values mod P?

I haven't been able to answer this daunting question for days now and I am not able to find the right resource for it, so maybe someone here might help me out. Consider an outer product of two ...
36 views

### dependent samples & correction for multiple testing

I have situation in which I compare many genomic regions between two or more cell lines (CL). Each region is covered by n probes measuring the level of methylation (continuous variable). The coverage ...
20 views

### how to analyse tail dependence coefficients?

How can I analyze the $\lambda_U$ and $\lambda_L$ results (estimated by non-parametric method)? what does higher or lower coefficients mean? Does $\lambda_U = 0.5$ mean there's some kind of linear ...
23 views

### Transformation of Martingale Differencce

We know non-zero measurable transformation of a dependent sequence is dependent. I want to ask if a non-zero measurable transformation of a sequence which is not martingale difference is not ...
13 views

### How can I do supervised classification with qualitative dependent variables?

How can I do supervised classification with qualitative dependent variables? A latent class model is not possible because variables are not independent.
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### Correlated/dependent random variables

This may be a very basic question or a very difficult one, I am not sure. What does it mean if two random variables are perfectly correlated? What does it mean if two random variables are perfectly ...
148 views

### Why is dependence a problem?

I'm interested in why dependent observations are a problem in statistics. Let's say you want to know if there is a difference in mean exam scores between two schools. You collect 50 observations in ...
63 views

### Comparison of dependent but unpaired data sets

I'm trying to find a statistical test that can help me compare the means of two dependent groups. My data: parameter values from white matter region in an in vivo rat brain parameter values ...
44 views

### How to simulate multiple dependent 2x2 tables?

I am doing a case-control study where we have a large number, say $N$ of 2x2 tables. For a single table we have fixed column totals, say $n_{+0}$ and $n_{+1}$ such that $n_{+0} + n_{+1} = n$, the ...
62 views

### quantifying interaction between variables in an equation

What do I need to measure interaction between variables in a particular equation? For e.g. Me just taking 50 grams of protein everyday will help me health wise. Me just doing exercise for 1 hour ...
73 views

### How to check dependency on nominal variables?

I have data that map one real (float) and several nominal arguments to one real value: y = f(r, n1, n2, n3, n4) If I check dependency of ...
265 views

### Is correlation equivalent to association?

My statistics professor claims that the word "correlation" applies strictly to linear relationships between variates, whereas the word "association" applies broadly to any type of relationship. In ...
145 views

### Extrapolating subset of data between dependent variables from distinct distributions

I would like to compare two datasets produced by an experiment under different conditions (sets A and B). The output of this experiment is made of two variables, X and Y, read at the same time. I'm ...