Questions tagged [contingency-tables]
Tables of counts (occasionally proportions of marginal counts), arranged by (at least) two marginal categories, displaying bivariate or multivariate frequencies. Sometimes called crosstabs.
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Why do we usually test independence of row/column variables of a contingency table with a chisquare statistic?
For an $r \times c$ contingency table, the cells containing observed frequencies, the null hypothesis "the row and column variables are independent" is typically tested by using a $\chi^2$ ...
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Equivalent of one-tailed Fisher's exact test for enrichment of the diagonal in 3x3 contingency table?
I have 2 ordinal variables A and B with 3 levels each (e.g. "down", "no change", and "up"). I want to know whether the up/down changes indicated by A and B are consistent ...
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Testing dependence of two categorical variables with data separated by test subject
This relates to a real-world experiment I'm working on. Let's say in my experiment, test subjects look at pictures of sunglasses that are either red or blue, and then label them "cool" or &...
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What hypothesis testing method should I use for comparing binned latency counts
I am trying to select a proper hypothesis testing method for testing if the latency is higher in a group of servers is higher than another group. However, all what I have is just counts for a number ...
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Lower threshold for Sequential Probability Ratio Test on Contingency Table testing
For testing whether a die is fair, we have the log likelihood ratio:
$$
\Lambda = \frac{1}{2} \sum_{i} \mathrm{observed}_i \log\left(\frac{\mathrm{observed}_i}{\mathrm{expected}_i}\right).
$$
Suppose ...
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Were two 2x2 tables drawn from the same population?
How might one test the null hypothesis that two 2x2 tables (of frequencies) were drawn from the same population?
More specifically, I have two 2x2 samples of unequal sample size. I would like to test ...
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Estimate subgroup sizes with a a given OR including CI and total sample sizes
We are doing a meta-analysis using OR as the effect size, but on a limited number of trials. The data is a bit messy and some numbers are missing - at least for our purposes. I was wondering if there ...
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Am I using the appropriate statistical comparison tests & applying them correctly to my qualitative coded data?
I am trying to determine if I am using the correct statistical tests in making comparisons & finding out if there are any statistically significant shifts of student attitudes. I have three open ...
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Can Cramér's V or contingency coefficient be used if chi-squared assumptions are not met?
I am testing for the independence of a specific set of variables with respect to a common event. Despite having a fairly decent sample size (n=236), the event I am testing for is relatively rare (2% ...
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Performing "exact" G-tests in R with contingency table samples using `r2dtable` [closed]
I am interested in performing the "exact" versions of G-tests of independence in R with nonparametric table enumeration after having been told that this could help with achieving more ...
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Is there alternative to Fisher's Exact Test for 6X2 contingency table with the hypothesis of "less than"?
I have a table of contingency which is 6X2 and in my case, it is not an option to "convert" it in a 2X2 table. Also, I need to be able to use the hypothesis of "less than" and &...
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Chi square test of independence with year as a categorical variable?
I suppose that this is a very simple question, and I have just now recently started doing stats.
I am working on a dataset with count data relating to discontinuation/continuation of a specific ...
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Testing for Association in RxC Contingency Tables with 1 Ordinal Variable
I'm currently trying to analyze data similar to the following example:
Suppose I have count data from a survey of US States (~10) relating to
their population's feelings about how their current state ...
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Statistical significance for difference in mean proportions when comparing groups
I may not have described my problem precisely, but I hope I can illustrate it with the following example.
Suppose that I have $m$ contingency tables:
Col 1
Col 2
Total
Row 1
$a_i$
$b_i$
$a_i+b_i$
...
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Performing a Fisher test when the odds of the events not occurring are known to be very low when compared to the events occurring
Let's say I have a contingency table like this:
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