# Questions tagged [non-independent]

Data, events, processes, etc, are non-independent if knowledge of 1 provides some information about the state or value of the other.

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### Violation of Independence of Observations - Logistic Regression

Apologies if this seems a basic question but I can't find enough detailed information about what exactly constitutes a violation of independent observations. The regression I'm wanting to run is ...
1answer
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### How to test mean differences in proportions that are dependent

I have an experimental setup where I have allowed groups consisting of about 50 animals to select between two environmental conditions. I.e. animals had the possibility to move between the two ...
1answer
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### Comparing Spearman rank correlations between many dependent lists

I have a list of values $S$. I want to compare the Spearman correlations of $S$ with $N$ other lists of values $O_k$ ( $k∈[N]$ ). The lists $O_k$ are not independent. Each value $O_k^j$ ( $j∈[|O_k|]$ )...
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### Treating dependent timepoints as independent

I've been given a data set to work with that includes measurements of the same group of individuals over approximately 6 months (3 measurements total). The problem is that they did not include any ...
3answers
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### Sign of Covariance and of Spearman's Rho

Has anybody available a proof that the covariance between two variables has always the same sign as Spearman's Rho, assuming that both are not zero, or an explanation / counterexample to show why this ...
0answers
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### Dependent variables, regression

I am trying do make some descriptive statistic. In my dataset I have ID, Age, time from start of being registered, sex, birth-place. The time from start of being registered minus date 15 June 2019 ...
0answers
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### Is an autoregressive model considered a model for independent or dependent data?

It seems to me that, in the statistical literature, data, models, and inference seem to conflate the terminology of dependent and independent. Case 1: a cross sectional sample of weight and height ...
1answer
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### Is there a way to cluster data using a dependent variable? [closed]

We are conducting research on neighborhood mail response behavior, i.e. what percentage of people in a neighborhood reply to a piece of mail. Based on regression analysis, we know which factors (% ...
0answers
39 views

### Repeated measures/pseudoreplication - Comparing all samples against all other samples

I am currently analysing some data, and I am not confident that I am going about it in as statistically sound way. We are trying to determine whether our treatments affect the distance between two ...
1answer
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### How to deal with subset of variables that are invariant for subsets of sample

I am thinking about a problem in which I have a sample which consists of subsamples with the same values for a subsample of independent variables. I want to apply a simple linear regression with ...
0answers
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### Test to compare means of non independent samples with repeated measures

I am struggling a little to know if I am comparing independent or not independent data and I am not sure what kind of test I should use. Here is the pitch : I would like to compare latencies between ...
0answers
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### Extract covariate adjusted dependent variable from linear regression model?

I want to adjust a continuous (dependent) variable for two independent variables (1 categorical, 1 continuous) and then use the residuals + intercept for plotting by another categorical variable. Is ...
0answers
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### Use of a predictor variable for a dependent variable that is directly related to the predictor variable

If I would like to predict a binary variable x, and x is true if y is true and ...
1answer
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### Correct C-Vine Configuration to emulate a predefined correlation matrix

I am trying to simulate a vine copula with a predefined dependence structure, so I can generate samples for my desired dependence structure. However, I am having trouble defining the Vine structure ...
1answer
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### Alternative to GLM with non-independant observation

I would like to perform a regression to study association between 3 categorical variables and a presence/absence response variable. I was planning on using a GLM. However, my observation unit being ...
0answers
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### Confused about multilevel analysis and non independence of observations

I'm still struggling with my understanding of multilevel analysis, wondering if it applies or not to my problem. I'v read here the following (where author gives an example of a multilevel model with ...
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### Testing statistical independence before using ICA

First a little bit of background. I'm interested in exploring the performance of Independent Component Analysis (ICA) in the context of disentangling intracranial EEG signals. These signals are ...
0answers
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### Statistical test to compare dependent samples

I am comparing by race the number of limbs (4 total - including both arms and both legs) affected by condition X. Some patients contribute 4, some 1, and some somewhere in between. I want to compare ...
0answers
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### Correcting for sample overlap (loss of statistical independence) in two z-tests

Short form: How can I correct two p-values computed from normal distributions to account for the fact that part of the samples overlap? Long form: I have a sequence of i.i.d RVs of length $n$. The ...
0answers
230 views

### Dependent vs Independent events (Conditional Probability using a pair of dice)

I am watching this video on YouTube to understand dependent and independent events and conditional probability. The example author uses is of a pair of dice. There are 2 dice, Red and Green, let's ...
1answer
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### Which statistical method should use to compare two dependent data (from 1 patient) but not paired?

I want to compare the number of lesions worsening and non worsening on superior to inferior side of the eye of a group of patients. I want to compare if the proportional results (the total sum of ...
1answer
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### Are basic multilayer perceptrons well-suited to prediction of non-independent events?

Multilayer perceptrons are great for discovering associations between variables defining independent events based on the same underlying associations in reality. Less cryptically put, MLP's are great ...
0answers
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### Expectation of the minimum of dependent random variables

How do we compute the expectation of the minimum of dependent random variables? In other words, what is the value of $\mathbb{E}[Y]$ in the following case:  \mathbb{E}[Y]= \mathbb{E}\big[\min(X_1,\ ...
0answers
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### Critical value for Mann's test against trend

To test that a sample $X_1,\ldots,X_n$ are i.i.d against that the distributions of $X_i$ are stochastically increasing in $i$, how to find the distribution of the test statistic and the critical value ...
0answers
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### Variables relationship in large multidimensional datasets

Suppose I have quite a large time series (e.g., daily car accident rates in London for the past 20 years) and I also have further datasets for the same time period (e.g., daily precipitation, wind ...
0answers
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### Compare treatment effects across Levels of aggregation

Suppose I am running an experiment to see if a treatment changes the mean weight of a group of people. Note that I am specifically interested in the mean weight: if half the people get heavier, and ...
1answer
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### Can ANOVA be used for percent frequency data?

Problem: Suppose there are three restaurants in a town. I conduct a survey by asking each person what percentage of time you eat in restaurant A, restaurant B and restaurant C. The percentages for ...
0answers
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### How to compare 3 dependent conditions?

I have the result of an experiment for N subjects. The experiment results in 3 possibilities, the subject choose A, B or C. For each subject, the experiment is repeated 10 times. So I have ...
1answer
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### re-analysis of someone else's data: 5 treatments x 4 non-exclusive outcomes

I am trying to re-analyze (ETA: used loosely; the original study performed no statistical analysis) some published biological data (below). They used 5 treatments and scored presence/absence of 4 non-...