Questions tagged [cramers-v]

Cramér's V is a measure of association between two categorical variables.

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Correlation between day type

Assume you got a list of efficiency rates for daytypes (and weeks) in percentage. And you want to calculate the correlation between those, so chi square or cramers V right? The values won't add up to ...
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What conclusions can I draw if my sample size is too small

I'm working on a paper involving multiple comparisons that have very small sample sizes (and no chance of increasing them). When I calculate p-values, they usually are not less than the usual .05-...
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What is a use case guide for best practice relatedness metrics between the following variable types?

I'm new to data analysis and I've been messing it up by using Pearson's correlation coefficient to measure possible relationships between different variables in my data set, both dependent and ...
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1answer
38 views

Interpreting the results of p-value and Cramer's V value

For my assignment I am working on a data set with the sample size n = 4.000.000 and about 450 columns. I have 4 rows in my cross table that have the values winter, spring, summer and fall. So my cross ...
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52 views

Pearson's Correlation for percentage data (observations within variable sum up to 100%)

Suppose the following dataset: ...
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1answer
361 views

When to use Theil's U and Cramer's V, the danger of symmetrical data?

As I understand, Cramer's V method of counting correlation between categorical variables may find correlations between symmetrical data. I searched a ton of sites, but the only thing I found was that ...
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1answer
148 views

Autocorrelation for a categorical time series

I am having trouble to compute the autocorrelation for different lags in a categorical time series. For instance, consider 3 possible categories: classA, classB and classC, and a vector x representing ...
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1answer
186 views

RxC Contingency Table to 2x2 Tables for local correlation analysis

I am trying to find if there is a correlation between the two categorical variables (Var1 and Var2). For that I am performing Cramer's V test on the RxC contingency table since the test that gives the ...
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2answers
55 views

Creation of contigency table and calculation of effect size (Chi2, Cramer's V)

I am a bit unsure in my approach of applying the Chi2 GOF test to my data and calculating the correct effect size. The situation: I am studying the occurrence of specific biological phenomena in ...
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60 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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1answer
331 views

Appropriate strength test of the chi-square test for large and unbalanced data

I understand different statistical tools have their own pros and cons. I'm trying to find the most appropriate one for my situation. I have a large, unbalanced data set and want to implement the chi-...
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Can Cramér's V be used an effect size measure for McNemar's test?

I'm using McNemar's exact test (with R's "mcnemar.exact" function). I know that giving the odds ratio or proportion would be an adequate measure of effect size (Effect size of McNemar's Test), but ...
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1answer
170 views

Cramers v when r = 1 and k = 2

I have just read that 'Cramér's V may also be applied to goodness of fit chi-squared models when there is a 1×k table (e.g.: r=1)'. It then goes on to say 'In this case k is taken as the number of ...
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9k views

Chi squared test result and Cramer's V value

I have one dataset which contain many categorical variables. The target variable is also categorical. I tried to find correlation between each categorical variable with target variable, using chi ...
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2answers
351 views

One sample chi-square

I have analysed very data set using an online calculator. I used a chi-square comparing the differences between 'strongly agree/agree' versus 'strongly disagree/disagree' to specific ...
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1answer
6k views

interpreting Cramer's V results

I want to measure the magnitude and direction of a relation between two nominal variables: profession and hood. I choose to use Cramer's V based on this explanation. ...
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255 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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215 views

Huge Chi-Squared Chi2 Test for Independence Statistics; is this methodology correct?

Beginner association question here. I have a dataset (~2.5M rows) with the following data: ...
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117 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
835 views

Is there an alternative to Cramer's V for computing effect size when chi-squared is inappropriate

I have a dataset within which I have a particular response variable that I'm interested in and numerous predictor variables. All variables are nominal and have as many as 15 possible values. When I ...
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1answer
1k views

How to apply Cramérs $V$ on a 2$\times$2 matrix

I want to find the association between variables and Cramérs V works like a treat for matrices of sizes greater than 2$\times$2. However, for matrices with low frequencies, it does not work well. For ...
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Regarding the interpretation of Cramers'V and Phi

How should I interpret Cramer's V when I have more than two variables in cross-tabulation table? Does the order of variables matter? E.G Gender , Age , Job , Income level Is Cramer's V the ...
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1answer
519 views

association measure and statistical test for binary and ordinal variables in large datasets

Which statistical test and measure of association should I use in the following situation? I have a rather large dataset (>30 million obs.). I have a binary variable, and a bunch of other variables (...
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How do analyse if a difference between two scores of Cramer's V is significant?

Previous research shows that there is a correlation between two variables. I am researching whether this is true in different groups. It seems like there is: Group 1: X2 (2) = 44.822, p < .001, ...
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Comparing and ranking differentiating attributes across groups

I'm looking for some help on how to approach this problem. Say I have two or more groups of people. Each group has characteristics and attributes. For example, say we have the following two groups: ...
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1answer
3k views

Effect size for goodness of fit chi-square

I would like to assess the effect size of a goodness of fit chi-square test. I have a variable that can have 3 states and test against a custom expected value. I used a variation Cramér's V for a ...
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163 views

What are the different ways to discretize continuous features?

I'm working on classification problem. I have a set of continuous & discrete features and I'm trying to list my features in their order of significance. Using chi-squared test as a filter & ...
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1answer
314 views

Cramer's $\phi $ for three-way contingency tables

Can Cramer's $\phi $ be determined for three-way contingency tables? I know how to calculate the expected values, chi squared, and how Cramer's $\phi $ works with two-way contingency tables. However, ...
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2k views

$\chi^2 $ of multidimensional data

I want to test if two observations of nominal data accord to the same distribution. I am using the chi squared statistics to perform a chi squared homogeneity test and normalize the result with Cramer'...
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284 views

How is p-value performing as a measure of association?

It's known that Cramér's V (Chisq adjusted for table dimension and sample size) is a good measure of strength association. But what about the p-value? P-value (as a probability of the numbers we have ...
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1answer
77 views

Determining $\chi^2 $ for Cramer's $\phi $

I intend to determine Cramer's $\phi$ for two contingency tables of the following form: ...
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1answer
691 views

What is the best visualization for Cramér's V?

When visualizing a linear correlation between two continuous variables, one uses a scatter plot, usually in combination with the Pearson product-moment correlation coefficient. When doing the same for ...
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2k views

How do I convert Cramer's V to Cohen's d?

Say I have a chi-squared test that compares 3 different groups: $\chi^2_2 = 9.81$, $p=.012$, Cramer's $V=.33$ How would I go about converting this to a $d$-statistic? Is the proper approach in ...
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6k views

Is it possible for Cramer's V to be negative?

To my understanding, Cramer's V cannot be negative because of the way we define it. But here's what I got from SAS:
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107 views

Cramér's $V$ for one variable

In Wikipedia's summary on Cramér's $V$, it is mentioned that it can (also) be used in the one-dimensional case as measure of concentration. What is the formula in this special case? Is there any ...
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590 views

How to convert Spearman's $\rho$, and Cramér's V to Cohen's $d$?

Is there a way to convert both, Spearman's $\rho$, and Cramér's V into the same effect size (f.e. Cohen's $d$), in order to have an information about which of the underlying relationships (nominal&...
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Can the formula developed by Olkin und Siotani (1964) also be used to compare correlations from Spearman's $\rho$ and Cramér's $V$

The followgin formula is normally used for comparing two Pearsons $r$ correlations: Can this formula also be used to compare correlations from Spearman's $\rho$ and Cramér's $V$?
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How to interpret Pearson's $r$, Spearman's $\rho$, Cramér's $\phi_{c}$ and Cramér's $V$ correctly?

Is it right that both Cramér's $\phi_{c}$ (and consequently Cramér's $V$ as well) are similar to the Pearson correlation coefficient, $r$, (and so, to Spearman's $\rho$) in its interpretation, as it ...