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Questions tagged [association-measure]

Measures of the association between variables, a more general concept than correlation

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1answer
27 views

If the datapoint furthest from the y‐axis was excluded, what would happen to the associations seen?

looking at the Figure below, what would happen to the association if the datapoint furtherst from the y-axis was excluded? Current linear association indicates: Diabetes prev = -0.0171183 x BT ...
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1answer
25 views

Why do signs of association change in multilevel logistic regression?

In given data, the outcome of interest is a binary variable (who participated in the program? yes/no). Additionally, individuals are nested within districts that create correlated binary data. I've ...
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0answers
12 views

Measuring Similarity or Association between unpaired data of different sizes

Is there a way to measure the association or similarity between two variables that are not paired. For instance if I have 3 variables with sample sizes of $n_{1} = 10$, $n_{2} = 15$ and $n_{3} = 15$ ...
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0answers
21 views

The relation between copula and survival copula

There are two relations connect between copula distribution function and copula survival function I got confused between them $¯C(u,v)= u + v -1 + C(1-u,1-v)$ $C(u,v)= 1 - ¯C(1-u) - ¯C(1-v) + ¯C(1-u,...
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2answers
14 views

How can I analyse the association between a categorical variable (binary outcome) and a continous variable especially in R?

I want to analyze the association between a binary variable and a continuous variable in R. But I am not clear about what steps I should follow. I explored the continuous variable by the histogram ...
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0answers
20 views

Are there any assumptions about row/column margins in a chi2 test?

I just learned that most tests of associations on 2x2 tables have assumptions about row and column margins being fixed or not. Is there any similar assumption when it comes to chi2 tests? Can I do ...
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1answer
35 views

How we can prove this relation for Kendall's tau

I found the relation below while studying the measure of dependence. How we can prove this relation about Kendall's tau? $$ \tau = 4\int\int H(x, y)\, h(x,y)\, dx\, dy - 1 $$
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1answer
29 views

Comparing observed binomial data with data simulated from a physical model

I have ~20 datasets which contain data that I assume is, conditional on a single variable, binomially distributed. I have built a physical model of the process generating the data and can simulate ...
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0answers
19 views

Interpretation of chisquare and odds ratio

I am studying te association between variables and used the chisquare test and the odds ratio of fisher exact test. I would like to know the exactly interpretation that i can do. The main variable is ...
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0answers
23 views

Which statistical analysis model to use to calculate the relationship between diabetes incidence and endothelial function?

I have longitudinal data with 2 follow ups at year 1 and 3. At baseline we have measure of endothelial function and we want to calculate the relation ship between endothelial function and diabetes ...
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0answers
36 views

Relationship between two categorical variables

I have collected data for Dish Name, Cooking Method, Type of Dish, Cuisine and Nature ( given below ). I am trying to find out relationship between Cuisine and Type of Dish. I have tried to implement ...
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1answer
196 views

Correct use of the sample weights in a complex survey design for association analysis (Logit OR)

I've doubts about the correct use of sample weights in the NHANES survey, which uses a complex, multistage probability sampling design (1). I'm aware about the importance of the use of the sample ...
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0answers
28 views

association rule graph understanding

What does the direction of arrows stand for? Some arrow going into the bubble, and some arrows pointing out the bubble to a specific item. Very lost.
3
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1answer
237 views

Interpretation of R output from Cohen's Kappa

I have the following result from carrying out Cohen's kappa in R ...
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1answer
25 views

Get association of categorical variables

I do a text analysis where I want to identify dependencies among categorical variables, for example let's take this dataset: ...
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13answers
5k views

If 'B is more likely given A', then 'A is more likely given B'

I am trying to get a clearer intuition behind: "If $A$ makes $B$ more likely then $B$ makes $A$ more likely" i.e Let $n(S)$ denote the size of the space in which $A$ and $B$ are, then Claim: $...
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9 views

For a meta-analysis study, is it correct to derive specific haplotypes from multiple studies that report varying number of SNPs at a gene locus?

My question is based on conducting a meta-analysis on the association of multiple variants in a single gene with a complex disorder using published case-control studies. For my study, around 5 well-...
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0answers
20 views

Optimation Association Rule Using Genetic Algorithm

i have association rules that i got from FP-Growth algorithm and i want to optimize that association rules using Genetic Algorithm so i can get the strong rules. Does anyone know how to bring the ...
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0answers
34 views

If I have less than 5 elements in a cell is there a way to use Chi Squared? [duplicate]

I have some data which has less than 5 elements in a cell, which would usually lead to fishers test being used instead. However, I'm unable to use fishers as there's not enough memory for it. chi ...
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1answer
38 views

How to measure the association/correlation between two unordered category distributions

I have seen the questions like Correlations with unordered categorical variables , but I cannot implement the chi-square test since I don't have a chi-square table representing joint distribution. ...
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0answers
29 views

Pointwise Mutual Information Word Dependency

I have pre-defined concepts which are either a single word or couple of words that refer to a concept.( In the context of machine learning for instance, covariance matrix is a concept). I am trying to ...
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1answer
28 views

Independence and strength of association between categorical variables

I am pursuing my master's thesis in Global Health at Uppsala University. One step in my statistical analysis involves "consumption of ultra-processed food (UPF)" as the independent variable (having 3 ...
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0answers
35 views

correlation between binary dependent variable and independent ones

I ran a logistic model to predict a YES/NO (equivalent to 0 or 1, that is a binary variable) through a stepwise selection (I have either categorical and numerical variables). I was then asked to ...
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0answers
12 views

Analyzing/modelling discrete numerical responses and determining associations based on categorical co-variates

I need and would be grateful for some advice regarding the analysis of some data that has been gathered and coded by a third party. The data is part of a project regarding performance in the health ...
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0answers
20 views

What test to use with many groups and interactions

I am trying to design an experiment with impact of many factors on one variable, the basic idea is to measure variable A when facing factor 1, factor 2, factor 3, etc. Secondly I would like to ...
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1answer
245 views

How to test whether the association between two continuous variables varies by a third variable?

If I have two continuous variables, and want to check whether their association varies by a categorical variable (e.g. gender), is there a formal statistical test for this? I know I can create a ...
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0answers
48 views

Finding the “optimal” non linear relationship between two variables

I am looking for finding associations between a binary outcome regarding women fertility and several potential risk factors. Since this study is quite exploratory, I was planning to include all my ...
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1answer
43 views

Association rule lift ratio converging to 0.5, is it not independent?

As far as I know, lift is a measure used in association rules to see whether there is a positive association between two items(instances?) I've done a simple (possibly wrong) simulation with lift ...
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0answers
280 views

How to compute p-value for Goodman and Kruskal's lambda and tau

How do I calculate p-values for Goodman and Kruskal's lambda and/or tau tests for association between categorical variables (measure improvement in predictability of the dependent variable given the ...
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1answer
554 views

Association, relationship and correlation

Are measures of association, relationship and correlation the same? Different textbooks uses those words interchangeably and Im wondering if the they are the simply the same...
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1answer
78 views

Calculation of relative performance gain

I want to measure the improvement of students using exam marks of semester 1 to semester 3. The following detail should be considered when calculating the measure; If Student A get 30 (sem 1) and 50 (...
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1answer
322 views

how to measure the correlation between non-normally distributed numeric variable and nominal variable?

I have two nominal variables and some numeric variables. The first nominal variable is a binary one. I want to measure the correlation between this binary variable and the other numeric variables. ...
3
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1answer
69 views

How can a variable have a positive association through logistic regression, yet a negative association through Cox regression?

I am undertaking some medical research using R. My outcome of interest is mortality in the intensive care unit. Data My data looks like this (there are ~15,000 rows). ...
3
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1answer
259 views

Why is Kendall's tau not consistent?

Kendall's tau measures the concordance between the two observations. For example, for $(X_1, Y_1)$, and $(X_2, Y_2)$, the pair is said to be concordant if $X_1 > X_2$ and $Y_1 > Y_2$, or $...
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0answers
96 views

Should I go back to do conventional logistic regression after LASSO logistic regression?

I used to use simple (multivariable) logistic regression plus stepwise regression to select important predictive variables. Though, I saw many critics on this method. Thus, I plan to use LASSO and ...
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1answer
149 views

Tail dependence of copula

There are some copula families that are able to deal with upper tail dependence (Gumbel and Joe copula) or lower tail dependence (Clayton). We can also rotate these copulae to have another copula. For ...
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1answer
200 views

What are the thresholds for strength of association?

As I was studying Cramers-V I saw two different Youtube videos authoritatively hand down 2 different sets of thresholds for strengths of measures of association. The first video said that 0-.29 was ...
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1answer
141 views

Statistical association test between ordered and unordered variable

I want to test the association between 2 variables : - one is an ordered factor from quantiles of a numeric value ("Q1", "Q2", "Q3", "Q4") - the other is an unordered factor from groups of a ...
2
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3answers
240 views

Generalized Sensitivity and Specificity

I'm interested in notation and terminology regarding performance measures related to Sensitivity (SEN) and Specificity (SPC). These two measures are commonly used in binary classification problems. I'...
1
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1answer
37 views

Correlation between a continuous variable with the 'slope' of repeated intensity measures (50%, 100%, 200%…)

I have data where I assess pain scores to different intensities of electrical stimulation. Every subject is given 50%, 100%, 200%, 300% and 400% of their pain threshold intensity (i.e the intensity ...
2
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1answer
83 views

Significance of association between categorical variables

I am analyzing survey data collected among plant breeders. I want to know if there is any association between some of the variables we collected, namely their perception of climate change and the ...
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3answers
5k views

If X can predict Y in regression, why isn't Y guaranteed to predict X?

Intuitively, if X can predict Y in a multiple linear regression model, $y$ = $\beta_0$ + $\beta_1$$X$ + $\beta_2$$Z$ + $e$ X and Y are associated. Since there's an association between them, why is ...
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0answers
304 views

Association rules between many continuous variables

I have a large dataset and I'm trying to mining association rules between the variables. My problem is that I have 160 variables among which I have to look for the association rules and also I have ...
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0answers
110 views

Is there a Correlation metric for Categorical vs Numerical features? [duplicate]

I've been searching for some time for a correlation metric analogous to the Pearson correlation value for numerical vs numerical features, or Cramér's V for categorical vs categorical features, but ...
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1answer
57 views

Statistical Significance Test (Genotypes and Race)

I've been trying to think of the best way to approach testing for associations of genotypes (i.e. D/D, D/I, I/I) with ethnicity (i.e. African Americans, etc). Specifically, I would like to test ...
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0answers
2k views

Intuitive meaning behind support, confidence, lift and conviction

I'm learning about association rules and came across the common interestingness measures support, confidence, lift and conviction. I'm interested in the intuition behind your decision-making process ...
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0answers
141 views

Boschloo's exact test

I have following data in R: d1 <- matrix(c(24,2,63,11),2,2, dimnames=list(X=c("present", "absent"),Y=c("present", "absent"))) I want to test ...
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1answer
35 views

Searching for a mathematical tool to study relationships between time series

I have three kind of time series data. Traffic flow data (jam factor, average speed) Weather data (for example temperature, humidity, pressure, wind speed, wind direction) Pollution data (PM 2.5, PM ...
1
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1answer
217 views

Measures of association between nominal variables with the same categories (paired nominal data)

Scenario: I am conducting a study in which I am comparing a ‘gold standard’ assessment protocol with an experimental assessment protocol for a health variable of interest, over a common set of study ...