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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25 views

Meta-analysis of RR and OR calculated from 2x2 tables in R using metafor

Background My question concerns the calculation of risk ratios and odds ratios for meta-analysis using the metafor package. I know it looks long, but please bear ...
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1answer
32 views

Post-hoc Tests for Fisher's Exact Test

I am running a series of Fisher's test to analyse some 2x2 contingency tables with small values. I have found significance. Is there anything equivalent to Cramer's V or the Odds Ratio or some sort of ...
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2answers
197 views

Bayesian analysis of contingency tables: How to describe effect size

I'm working through the examples in Kruschke's Doing Bayesian Data Analysis, specifically the Poisson exponential ANOVA in ch. 22, which he presents as an alternative to frequentist chi-square tests ...
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16 views

One-Tailed Fisher's Exact Test [duplicate]

How can I calculate p using a one-tailed fisher's exact test for a 2x3 (or 3x2) contingency table using excel? I found the formula ...
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0answers
17 views

Cochran-Armitage test for trend in a contingency table

I have a 2x4 contingency table and I'm testing for a monotone trend. How can the weights (scores) be applied in the following situation: The 1st category is expected to have no effect on the ...
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1answer
36 views

Name of this simple descriptive method for showing crosstable combination typicalities?

This might be a basic question, but I have no clue what this descriptive method could be named. Simplified, I have a cross-table with Occupations (e.g., doctor, lawyer, engineer) as rows, and Hobbies ...
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1answer
22 views

Sequential importance sampling for multi way contingency table

Full disclosure: this is a homework problem. I'm having a really hard time understanding the algorithm for applying SIS to contingency tables or what it even means to do sequential importance sampling ...
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1answer
158 views

How to interpret Cochran-Mantel-Haenszel test?

I'm testing the independence of two variables, A and B, stratified by C. A and B are binary variables and C is categorical (5 values). Running Fisher's exact test for A and B (all strata combined), I ...
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32 views

Testing association between two categorical variables, with repeated experiments

Say you are counting sharks and whales in the Atlantic and Indian occeans and want to check if eg sharks prefer the Atlantic and whales the Indian occean, as described in the example here. But instead ...
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0answers
18 views

How to compare the fit of two tables of percentages?

I have two tables, you can think of them of results of two models. I would like to compare them to a benchmark to evaluate which model is a better fit. What statistical technique do I need to do this ...
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1answer
71 views

Analysis method for count data with unequal sample sizes and categorical predictors?

I have a problem I've been going over and over for months to find the right statistical analysis method. I'm planning to execute the analysis in R, so any mention of appropriate packages is also ...
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2answers
67 views

Test of independence on contingency table

I have a simple contingency table with two nominal variables. Let's say Age and Gender. The software that I'm using reports the relationship between the two variables using Pearson's Chi-Square Test ...
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0answers
44 views

Testing equality of two or more contingency tables

Which options are there to test, whether two contingency tables of the same variables, say $X$ and $Y$, are equal across the levels of a third discrete variable, say $Z$? I can think of a log-linear ...
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1answer
35 views

Conditional table, how to fill it

I found this question and since I'm learning probability I'm not sure how to go about it: ...
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1answer
76 views

Contingency table analysis to rank preferences of birds per feature

I have a dataset that contains observations of objects that female blackbirds carry to their nests. The birds have id tags and the objects are grouped categorically with respect to their ...
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0answers
45 views

How to test association in contingency tables with very small numbers and proportions?

I have a sample of 197 responses. 8.6% (17)are from Group A, the remainder from Group B. (The groups are mutually exclusive, and not independent). (If it helps visualize the issue, Group A is under ...
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0answers
76 views

Fisher's exact test, very small sample size, RxC table, gave me bad result

I apply Fisher's exact test on very very small sample size. Each location in the table would have about 1 or two samples. The fisher's method has no room to enumerate the the tables, and returns me a ...
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0answers
22 views

Two-factor contingency table analysis where individuals can only choose between 2 options

I have an experiment where individuals can only choose between 2 options at any given time, and am interested in determining if two factors interact to influence the individual choices I observed. ...
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1answer
91 views

Contingency table with 2 different time series

I am trying to put the two time series of my Excel spreadsheet (see link below), into a contingency table. https://www.dropbox.com/s/2f96oylxj97fuih/example.xls The first series is the number of ...
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1answer
808 views

Fisher's exact test in 3x2 contingency table

I have two groups of patients (A and B) with a congenital malformation which might present itself in 3 forms (a or b or c). Sample sizes are small as you can see, so I think the best test to check ...
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1answer
518 views

Comparing 5 proportions/Post-hoc tests after $\chi^2$

I have one parameter, that is, a behaviour happened or not. I have then the proportions of animals who performed the behaviour under different treatments. I want to compare if there are any difference ...
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2answers
175 views

Assumptions in estimating probabilities from a contingency table

Say I have a database with 10000 protein sequences of the same species in it. I was to study if mutations at positions i and ...
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1answer
213 views

Somers' D (contingency table) in R

I need to compute the Somers' D for a contingency table (choosing between R|C and C|R), but I can't find any function to do this. I know there is the somers2 ...
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1answer
92 views

I study subpopulation so huge that chi-squares test insists it is not representative. How do I get confidence intervals for my population?

I want to get results about population A. But all I can study is subpopulation C of B, where B is a subpopulation of A (that is, C $\subset$ B $\subset$ A). Each member of A is classified into one of ...
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1answer
145 views

Does logistic regression use crosstabs?

I am performing a binomial logistic regression with my outcome being a count with an upper bound which is 45. My data is of the following form: Now I am wondering whether the actual analysis ...
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2answers
185 views

How to incorporate costs (into logit model) of false positive, false negative, true positive, true negative if they are different costs?

How to incorporate costs (into logit model) of false positive, false negative, true positive, true negative responses, if they are different costs ? Is it possible to do that on the level of ...
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40 views

Exact version of Bowker's test?

I know there is an exact version of McNemar's test for symmetry, and am just wondering if there is an exact version for Bowker's test. From my understanding the exact version of McNemar's test uses ...
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3answers
199 views

Stat test to compare two sets of binomial data

I am doing my undergraduate project and have tested a drug on cells for a responce. The data I have collected shows that the cells either produced a responce, or they did not. Binomial data? ...
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54 views

How to simulate multiple dependent 2x2 tables?

I am doing a case-control study where we have a large number, say $N$ of 2x2 tables. For a single table we have fixed column totals, say $n_{+0}$ and $n_{+1}$ such that $n_{+0} + n_{+1} = n$, the ...
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60 views

CMH-test, multiple contingency tables, unpaired entries

I have frequency data for 9 populations, divided into two groups, one of five populations and one of four. I am interested in whether these two groups are different. A classic way to analyse such ...
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1answer
96 views

Fisher's exact test, contingency tables

Are there any other methods for an $m\times n$ contingency table with $m$ or $n$ greater than 2 for use with small samples ($np<5$) other than Fisher's exact test?
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1answer
90 views

Goodness-of-fit for contingency tables

I have a question on testing mortality table. Suppose I am given a simple mortality table: ...
2
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1answer
137 views

Can I partition a frequency table and use Fisher's exact test instead of the chi-squared test?

I am working with very small cell counts, and am wondering if Fisher's exact test can be used in place of the chi-squared test when partitioning IxJ tables. I am interested if the same process for ...
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1answer
191 views

What is contingent in a contingency table?

The Merriam-Webster dictionary defines a contingent event or situation as ...
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1answer
277 views

Overlapping sets (3) - significance test

Sorry if this appears to be a naive question! I have three overlapping sets and I want to find the probability of finding a larger/greater intersection for 'A intersect B intersect C' (in the example ...
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1answer
125 views

Can I use 3-way ANOVA for testing the difference between small proportions?

I'm looking at daily purchasing data over a period of several weeks. Specifically, we're interested in the % of users who make purchases in our app (it doesn't matter the type of purchase or amount ...
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20 views

I need a calculator that uses a contigency table of 11x6 [duplicate]

I need a calculator that uses a contigency table of 11x6. Anyone knows where I can find a calculator for my case? Thanks in advance.
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2answers
144 views

Comparing contingency table distribution

I want to compare the distributions of $K$ contingency tables, where each table is $N \times M$. To make things clearer, let's work on $K=M=N=2$. Suppose I have a classical cases and controls test, ...
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3answers
220 views

Matched binomial pairs

I am trying to analyse the following table: 5 5 5 5 4 5 5 5 5 3 4 3 3 4 4 3 5 5 Each number is a success score out of 5 attempts, so we can assume binomial (p, 5), for unknown p. ...
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1answer
164 views

Comparing two nominal-scale response distributions

I have data from an experiment that consist of nominal-scale responses that subjects made in two treatments (the treatments are between subjects, not repeated measures). I've provided my data in data ...
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2answers
1k views

Testing equality of two binomial proportions proportion (one near 100 %)

I am testing equality of two binomial proportions 87/88 and 48/60. I use this online calculator and it noted that the Standard Normal approximation is not valid in this case. It seem quite strange to ...
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1answer
237 views

Achieving statistical significance in an A/B test

Out of one pool, I've randomly selected a small group (group A) and put everyone else in group B. Then, I'm observing whether or not they take a desired action. If I'm looking to test at a 95% ...
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66 views

Repeated measure problem (Discrete variables) [duplicate]

Possible Duplicate: Difference between generalized linear models & generalized linear mixed models in SPSS Repeated measure problem I have 6 subjects. For each subject, we measured ...
4
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1answer
400 views

Fisher overall p-value vs. pairwise comparisons

I am doing comparisons on response rates across three sites. Following are the cell counts ...
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4answers
334 views

Direction of relationship in 2x2 contingency tables

I've been studying contingency table analysis and got to experiment a little bit with Fisher's exact test and Fisher's power test. Now I want to be able to determine the direction of the ...
6
votes
1answer
81 views

Enrichment analysis by gene duplication level

Biological Background Over time, some plant species tend to duplicate their entire genomes, gaining an additional copy of each gene. Due to the instability of this setup, many of these genes are then ...
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1answer
179 views

Appropriate test for comparing two sets of binary tests?

I have items made from two different materials. For each material I took a set of 250 samples and subjected them to a test which either broke them or did not. Which test could answer the question - ...
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1answer
198 views

Mean regression factor scores and attributes cross tabulation yields. Why are all expected signs reversed?

I ran a factor analysis on 20 reasons for purchasing 4 different goods. These are ranked on a Likert scale from 1 to 5 with 5 being "extremely important", 4 "important", etc. I extracted 4 factors ...
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0answers
502 views

What is the difference between the 'Pivot table' and 'Contingency table'?

Is there any difference? Or it they are basically the same? Just excel users call it 'pivot table' and Statisticians call it 'contingency table'? Thanks,
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1answer
35 views

significant difference in preference

I have the following data X black brown 1 women 25 20 2 men 41 44 How can I see if there is a significant difference in preference between men ...