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0answers
5 views

Maximal number of possible transactions

Suppose I have a market basket with $10$ transactions and $6$ items. ...
3
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0answers
24 views

Positive dependence and functions of random variables

Is there a notion of positive dependence such that if $X_{1},\dots,X_{n}$ are positively dependent, then for any two functions, $a\left(X_{1},\dots,X_{n}\right)$ and $b\left(X_{1},\dots,X_{n}\right)$, ...
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0answers
12 views

Dynamic Time Warping finds erroneous similarity between time series

I am implementing 1NN using DTW as the distance measurement. It finds erroneous similarity between two time series when they are actually not similar. To give an example, let's suppose a & b are ...
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0answers
11 views

factors associated with change

Can someone help me to find the factors associate with change. I have repeated measures data of blood glucose of 700 patients for continuous four years. I have few other information about these ...
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0answers
32 views

Fisher's exact test vs kappa analysis

I was reading a paper where the authors assessed the association between two different diagnostics tests intended to diagnose the same disease and they performed the analysis with Fisher's exact test. ...
0
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1answer
29 views

Difference Cohen's $\kappa$ and Spearman's $\rho$ [duplicate]

What is the difference between Cohen's $\kappa$ and Spearman's $\rho$?
2
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1answer
79 views

Cointegration test between a stationary and non-stationary time series

I would like to determine if there is any association between two time series. One of the time series is stationary, the other is not stationary. In this scenario does a cointegration test make sense ...
0
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0answers
31 views

(Alternative to) Matthews correlation coefficient when only one class is present

In a numerical study I want to assess the performance of a binary classification algorithm learned repeatedly using different training datasets and applied to varying test datasets. The distribution ...
0
votes
0answers
27 views

Sample size for estimating association between two variables among a group of patients

I'm about conducting a research among a group of patients, aiming to explore the relationship between two characteristics within those group of patients. Each of these 2 characteristics (variables) is ...
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0answers
40 views

association between discrete variables and continuous variable

I am having little difficulty with understanding the difference between, testing association between two variables and modelling them. Say I have binary outcome x(sold, not sold), and i have all ...
0
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1answer
38 views

Association between two distributions where only tails matter

I have two bell shaped (but not normally distributed) data sets, A and B. In these, most of the values in the middle can not be trusted, i.e. they are probably noise. I am interested in knowing how ...
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0answers
5 views

selecting most similar ordering over many groups

Suppose we have many product categories with 2-4 products in each. Products within each category is ranked according to quality. This 'true' ranking is known, but the goal is to select a model out of ...
2
votes
1answer
324 views

Evaluating Association Rules Using Kulczynski and Imbalance Ratio

I have a dataset containing information about movies and their genres. From the dataset I have generated association rules from the frequent itemsets that I have mined using the Apriori algorithm. ...
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0answers
55 views

Measure of Association in categorical variables

I have a data a labelled data set with mix of categorical and continuous input variables, using which I have to do a predictive modelling. The data has following properties ...
1
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1answer
63 views

compare magnitude of association between pairs of discrete variables?

say I have discrete(nominal) variables Y, X1 and X2. X1 and X2 have different number of levels. I want to assess whether Y is associated more with X1 or X2. I understand that I could use chi-square ...
3
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2answers
195 views

Correlation between two ordinal categorical variables

What is the best statistical test for investigating if there is any correlation between 2 categorical variables? both are satisfaction scores: 1-First variable is: "Overall satisfaction with the ...
0
votes
2answers
159 views

Measure of association between non-dichotomous ordinal variable and continuous variable

I have to collect and then analyse a large dataset. A particular data input (continuous variable) is laborious to collect and I believe that an ordinal category (1,2,3,4) would correlate closely with ...
3
votes
1answer
219 views

Bootstrap confidence intervals

I write to you for 3 questions. I want to calculate confidence intervals on different measures of association (Pearson's correlation coefficient, Cramer's V and the Eta-square). I will make the ...
1
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0answers
14 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
votes
1answer
147 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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1answer
609 views

What is the proper association measure of a variable with a PCA component (on a biplot / loading plot)?

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 ...
3
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0answers
91 views

Is it statistically correct to compare two Spearman's $\rho$-values?

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
21 views

Measures of association, Concordant and Discordant [duplicate]

I want to calculate concordant and discordant pairs on nx2 tables. ...
2
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0answers
46 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 ...
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2answers
254 views

Non-parametric measure of strength of association between an ordinal 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 and will be approached as ordinal (X). I put below the ...
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vote
1answer
405 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 ...
2
votes
1answer
240 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
votes
2answers
79 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?
1
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0answers
24 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
votes
1answer
89 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
votes
1answer
71 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
vote
1answer
487 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: ...
1
vote
1answer
127 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
266 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
vote
1answer
29 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 ...
10
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1answer
7k 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
378 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 ...
1
vote
2answers
171 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
votes
1answer
99 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
votes
1answer
2k 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
votes
1answer
2k 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
votes
1answer
4k 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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3answers
8k 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
158 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
votes
2answers
112 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 ...
16
votes
2answers
9k 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 ...
13
votes
2answers
7k 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 ...
1
vote
2answers
219 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
votes
2answers
298 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 ...
4
votes
1answer
686 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 ...