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6 views

Downward closure property proof for Lift and Conviction

For associative rules r1=(A->B) and r2=(C->D) and Lift(r) and Conviction(r) are as defined here [http://michael.hahsler.net/research/association_rules/measures.html]. How does one prove that they do ...
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0answers
13 views

Calculate association between text documents [duplicate]

I've got 6000 reports. For each report, I've got a vector with the keywords in it and a vector with the tokens of its abstract. Now I want to calculate some association between those two sets. Is ...
2
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1answer
44 views

Curvilinear relationship between two Likert-Scales - is there any coefficient to measure it?

I have two Likert-scale variables, that values vary from "strongly disagree" to "strongly agree". Somehow I know, that many people who stronly disagree on the first scale, strongly agree on the second ...
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0answers
5 views

Apriori like algorithms

The Apriori algorithm predominantly works by pruning the possible itemsets by using a fixed threshold namely, support threshold(lowerbound). Are there any other metrics which can be used as an ...
4
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1answer
181 views

What is the proper association measure of a variable with a PCA component?

I am using FactoMineR to reduce my data set of measurements to the latent variables. Now, the variable map is clear for me to interpret, but I am confused when ...
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0answers
11 views

Measuring association using Cramér's $V$

I had measured the association between two categorical variables some time back. Now, I have even more data compared to the last time. I find that the Cramér's V values has decreased now. Is this ...
2
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0answers
45 views

Statistically correct to compare two Spearman's $\rho$-Vaules?

I have different variables (A, B, C, D) which are all ordinal scaled. I have another variable (Z) which is ordinal scaled, too. My sample size is approx. 1.500. Is it in the statistical sense ...
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0answers
16 views

Testing for independence and strength of association

I am having difficulty at formulating properly a null hypothesis regarding the following setup: Suppose that we are interested in probing a possible association between bundled products sold at ...
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0answers
21 views

Measures of association, Concordant and Discordant [duplicate]

I want to calculate concordant and discordant pairs on nx2 tables. ...
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0answers
15 views

One-way Chi-Square goodness of fit and Cramér's V

Would it make sense to apply a measure of association test like Cramér's V on a 1xk table? I am a bit puzzled because in the literature phi and Cramér V are normally used on 2x2 or bigger ...
4
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2answers
109 views

Non parametric measure of strength of association between a discrete and a continuous random variable

I'm throwing here the problem as I received it. I have two random variables. One of which is continuous (Y) and the other one which is discrete ordinal (X). I put below the plot I received together ...
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1answer
90 views

Chi Square test to measure degree of association

I have a categorical variable with binary outcomes 0,1 (say Y), I want to study the association with other variables X1,X2,X3,X4,X5..... most of Xi's are categorical and few of them are continuous. I ...
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19 views

Can Cramér's V tell me what to control for in my data?

For my research question, I want to find out if two different group types (IV) vary across position categories (DV) for eight different limbs. My data is nominal, so I'll be testing this by doing 8 ...
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0answers
27 views

Can i compare the strength of association that using phi & Cramer's V between the parameters?

I have a little question and need some clarification on chi square's strength of association (using the Phi & Cramer's V). Say i have 4 parameters, all of them show significant relationship with ...
2
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1answer
121 views

What is the best way to analyze additional attributes in a market basket analysis?

I am performing a market basket analysis of customers and the products they purchased. I did an a priori analysis on all of the transactions on the products they purchased to determine which items ...
2
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2answers
51 views

How to obtain a p-value for the eta measure of association?

How can a P-Value be obtained for an analysis of Eta association? Is there a reference for this?
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0answers
42 views

The use of rule statistics in classification

Recently I am working on some association rule mining problems. I have learned that during the post-mining stage, many statistical measures, such as lift, coverage, and conviction, can be used to ...
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0answers
19 views

3-way measure of association, nominal variables

Cramer's V does a great job of capturing the degree of association between two nominal variables. What measure is best suited for capturing a similar association between three nominal variables?
2
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1answer
56 views

How to measure association of nominal values for few observations?

I have a sample with 181 observations. I measured two nominal variables for each observation and now want to calculate the association between the two variables. The problem is that one variable has ...
2
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1answer
56 views

Word association

I'm doing an experiment with moodcongruency (influence of mood on word retrieval). Prior to inducing a mood, the participants will memorize a list of words containing an equal amount of positive, ...
1
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1answer
284 views

Problem with calculating Asymptotic Standard Error for Somer's D

I'm trying to calculate Asymptotic Standard Error (ASE) for Somer's D measure of association for some population data. The formula for variation (sd^2) I've found (in the article specified below) is: ...
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1answer
102 views

Generate two categorical variables with a certain association?

Say, I wish to simulate two categorical variables who are associated with each other like in the table: ...
2
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0answers
142 views

How to measure the strength of association between binary variables where the majority of values is zero?

I have two binary variables, $X_1$ and $X_2$, which take value in {0, 1}. The overwhelming majority of their values are 0. I wanted to know if there is a way to appropriately measure their association ...
1
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1answer
28 views

Assessing similarities in “call repertoire” for animal vocalizations

I have count data for number of call types over an interval of time for multiple animals. What I want is (1) a summary of association between call types (i.e., if X1 is large, X2 is small) and (2) a ...
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1answer
3k views

Similarity Coefficients for binary data: Why choose Jaccard over Russell and Rao?

From Encyclopedia of Statistical Sciences I understand that given $p$ dichotomous (binary: 1=present; 0=absent) attributes (variables), we can form a contingency table for any two objects i and j of a ...
2
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1answer
105 views

What is the distinction between “relationships” and “differences” (particularly in the context of group differences on a numeric attribute)?

What is the distinction between a relationship and a difference in the context of statistics - if you have a nominal variable and an interval variable, when should you use a correlation to measure the ...
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2answers
154 views

Measure the relation/association between the outcome and the independent variables

I am running a model (logistic regression) with 20 independent variables in R. Before running the model I calculated the correlation between all the variables and finally selected my variables by ...
0
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1answer
66 views

Quantifying the overlap in sort task results with cells < 5

We have data from two sort tasks where the same items (N=87) were assigned to different types of group ('g' & 'd'). We want to compare the overlap between the assignments to the 'g' groups (N=13) ...
2
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1answer
587 views

What is the optimal distance function for individuals when attributes are nominal?

I do not know which distance function between individuals to use in case of nominal attributes. I was reading some textbook and they suggest Simple Matching function but some books suggest that I ...
2
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1answer
897 views

Is ETA a good measure for computing the efect size between an ordinal and a nominal variable?

I have a nominal and an ordinal variable and I would like to look measure the association that is between the two. For now, I have done Chi-square test and non-parametric Kruskall-Wallis Test and I ...
3
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1answer
2k views

Ordinal trends and finding concordant and discordant pairs

A pair is concordant if the subject ranked higher on X also ranks higher on Y. The pair is discordant if the subject ranking higher on X ranks lower on Y. The pair is tied if the subjects have the ...
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2answers
2k views

Calculating Jaccard or other association coefficient for binary data using matrix multiplication

I want to know is their any possible way to calculate Jaccard coefficient using matrix multiplication. I used this code ...
2
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0answers
120 views

Appropriate threshold to map a similarity value to an edge in a graph

In order to cluster users given a user-item binary matrix data, I am planning to first find user's similarity (Jaccard) and then use graph theory to isolate clusters (communities). I need to map the ...
2
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2answers
88 views

Can feature selection be considered a way to observe relationship between variables like correlation?

In correlation we can observe relationship between a pair of variables, let me call it X1 and Y. Now, considering I have the predicting variables X1, X2, ..., Xn and the variable Y. Does the ...
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2answers
3k views

How do I test a nonlinear association?

For plot 1, I can test the association between x and y by doing a simple correlation. For plot 2, where the relationship is nonlinear yet there is a clear relation between x and y, how can I test ...
12
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2answers
5k views

Applicability of chi-square test if many cells have frequencies less than 5

To find association between peer's support (independent variable) and work satisfaction (dependent variable) I wish to apply chi-square test. Peer's support is categories in four groups according to ...
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2answers
202 views

Chi^2 test for 2x2-contingency table using probabilities instead of count data

I would like to perform a $\chi^2$ hypotheses test for association based on a $2 \times 2$ contingency table. However, my contingency table $$ \begin{array}{|c|c|} \hline \\ a & b \\ \hline ...
3
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2answers
260 views

How to calculate the correlation between smoking patients and heart attacks for each country?

I have a set of data on smoking patients and heart attack on different time points for 25 countries. How can I calculate the correlation between the smoking patients and heart attacks for each ...
3
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1answer
503 views

How do I get a $p$-value from the Cochran-Armitage trend test?

So, I'm working with GWAS SNP data and want to perform several tests for association between genotype and phenotype. There are two phenotypes (case and control) and 2 or three genotypes. Most of them ...
2
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1answer
418 views

How to decide between pearson, distance correlation or maximal information coefficient for currency data?

I have one dataset with currency exchange ratios for several years. The exchange ratios are for two Asiatic currencies and the Canadian dollar, all against American dollars. My (perhaps naïve) ...
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2answers
12k views

How do I study the “correlation” between a continuous variable and a categorical variable?

What's a meaningful "correlation" measure to study the relation between the such two types of variables? In R, how to do it? Thanks a lot!
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0answers
83 views

How to associate one predictor and 10 responses?

I have to test one predictor associate with 10 responses, the predictor is nominal, and response are continuous, so what kind of test can be used to test the association between them?
2
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0answers
91 views

Phi MOA, Chi-Square and Null Hypothesis, What can be learned?

In short, is there anything to be learned from performing a Phi measurement of association (MOA) on a Chi-Square test where it failed to reject the null hypothesis? $$\phi = \sqrt{\chi^2/N}$$ where ...
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0answers
115 views

How to compute effect size for different measures of association?

My colleagues and I are looking for guidance on how we might compute a common effect size (ES) from the following measures of association: Pearson's r Spearman's rho Kappa ICC / intraclass ...
2
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1answer
547 views

Association between 2 categorical data (using SPSS)

In a sample of 250 cardiac patients who have had a myocardial infarction and just left hospital, I asked them how important it was to them to know several issues, such as "How important is it for you ...
3
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1answer
815 views

Kendall's tau and independence

Kendall's tau is an association measure between two random variables, say $X$ and $Y$. If $X$ and $Y$ are independent, then $\tau = 0$. However, $\tau = 0$ does not imply independence because ...
2
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2answers
6k views

Correlation between dichotomous and continuous variable

I am trying to find the correlation between a dichotomous and a continuous variable. From my ground work on this I found that I have to use independent t-test and the precondition for it is that the ...
2
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1answer
515 views

How to combine many Goodman-Kruskal gamma measures?

I have 5 samples (from the same population). I want to calculate the Goodman-Kruskal gamma ($\gamma$) for the population, based on the gamma of the 5 samples ($G_i$). Each data has 2 ordinal ...
2
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1answer
67 views

Three-parts correlation or equivalent?

I'm wondering what's the usual way for detecting "three-parts" association between variables. I'm not even sure about the name, so I apologize for any misunderstandings beforehand. Here is what I ...
2
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1answer
233 views

Is goodness of fit needed for regression models when interpreted causally?

I'm investigating associations between socioeconomic factors and dichotomous outcome. I use generalised linear models (GLM) with log link for Bernoulli family, i.e., modelling the prevalence ratio. At ...