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# Questions tagged [correlation]

A measure of the degree of association among a pair of variables.

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### Correlation between similar time-series (breakthroughcurves)

first of as a disclaimer - I don't have much background, and only a very basic education when it comes to statistics. I have a couple of break through curves (BTCs) with different tracers and I want ...
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### Negative Correlation Fallacy [duplicate]

This is inspired by epsiode 4 of season 4 of Curb Your Enthusiasm. A major part of the plot of this episode is the weatherman, who just so happens to predict thunder storms when it is in fact very ...
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### Which correlation test to use

I'm working with datasets on economic inequality and crime rates at the county level to produce correlation matrices. My economic inequality data has several variables, which are percentage of county ...
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### meta question: Understanding correlation vs. effect size

For some context: I've been looking at some meta-analyses on factors that explain happiness (well-being), because I wanted to check the happiness-claim of a certain philosophy and want to be happy in ...
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### Regression with dependent observations of only one individual

Last week, I received a task to plan an analysis that my team wishes to perform. My objective is to measure if one physician agrees with the outputs that a certain tool generates for a set of N ...
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### Effect-Size Analysis: Cohen's D, Pearson's r, or something else?

I am trying to do an effect-size analysis on dam release's effects on downstream temperature. I have a large dataset of data loggers taking temperature readings at various sites downstream from the ...
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### Distribution of the correlation coefficient based on quadratic forms

Let $x,y$ be two independent random correlated vectors following the same multivariate (real or complex) centred normal distribution, and let $A$ be a non-negative linear operator. We can read here, ...
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### Comparing two unequal groups over time?

I am new to rstudio and statistics in general so bear with me. I am trying to compare the changes over time between two different variables, but they come from very different sample sizes. I am ...
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### Test for multicollinearity with binary and continuous independent variables

I have a question concerning multicollinearity: I have several independent variables. Some are binary and some continuous. The dependent variable is binary. Can I use the Pearson correlations to test ...
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### Looking for a suitable way to find groups of events

I have an excel file in which I have three columns. The first one is the name of an event, the second one is the moment the event starts and the third one is the time at which an event ends. Let's say ...
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### Correlation between proportion variable and categorical variable

I am interested in testing for the correlation between influenza activity and different periods (different decades). The variable influenza activity is a combination of two variables: ILI proportion (...
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