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0answers
4 views

Hard partitioning of the association matrix

I obtain a co-association matrix $n \times n$ that corresponds to the maximum likelihood estimate of the probability of pairs of variables being in the same cluster. Further suppose that there are $k$ ...
3
votes
2answers
65 views

How to interpret Fisher Test?

How do I interpret the odds ratio for this fisher test output in R? ...below is my matrix that I input into fisher.test in R: ...and below this is the output of the test in R:
4
votes
1answer
41 views

Measure of Association between two Ordinal Variables

I have two ordinal variables. One is independent and the other one is dependent variable. I would like to test if there is monotonic relationship between these two or not. I am using Somers' d measure ...
0
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0answers
11 views

Associating processes with load on the system

I am trying to find out the processes on our linux servers that are responsible for load on the system. We have an application server and an Oracle database server (both running Linux). The ...
0
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0answers
39 views

Prediction vs. association, why is prediction model (not association model) the only one that can be validated?

I am trying to understand the difference between prediction and association models, one thing I don't understand is in his slide http://www.stat.wisc.edu/~yandell/stat/50-year/Wei_LJ.pdf, Wei says ...
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0answers
36 views

How to find the association/relationship between two continuous variables?

enter image description here Hello, The attached image is the scatter plot of income and age. I understand linear and polynomial relations, but in the above case what is the right way or approach to ...
0
votes
1answer
10 views

How can I formally describe the count function of the support measure of frequent itemsets

currently composing a lecture on Association Rule Mining, Frequent Item sets. Therefore I need to formally describe the count function of the support measure as occurring int the following forumula : ...
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0answers
7 views

Maximal number of possible transactions

Suppose I have a market basket with $10$ transactions and $6$ items. ...
3
votes
0answers
26 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
18 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
12 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 ...
2
votes
0answers
57 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
84 views

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

What is the difference between Cohen's $\kappa$ and Spearman's $\rho$?
2
votes
1answer
108 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 ...
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0answers
39 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
33 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 ...
1
vote
0answers
43 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
41 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
8 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
526 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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vote
1answer
82 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
298 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
223 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
259 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
193 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 ...
5
votes
1answer
803 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
113 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 correct,...
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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
49 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 ...
6
votes
2answers
298 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 ...
1
vote
1answer
550 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
269 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
85 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
vote
0answers
27 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
103 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
73 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
536 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
140 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
votes
0answers
316 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
votes
1answer
9k 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
votes
1answer
514 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
174 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
103 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 ...
7
votes
3answers
10k 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
votes
0answers
201 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 ...