Tables of counts (occasionally proportions of marginal counts), arranged by (at least) two marginal categories, displaying bivariate or multivariate frequencies. Sometimes called crosstabs.

learn more… | top users | synonyms

0
votes
1answer
36 views

2x2 contingency table - maximum likelihood estimate of the odds ratio and exact confidence intervals

I have two questions regarding the following 2x2 contingency table: 1, How can I derive the maximum likelihood estimate of the odds ratio ($OR = (a*d)/(c*b)$) 2, How can I derive exact confidence ...
2
votes
1answer
73 views

Proper analyses for 2x2 contingency tables

So I have multiple questions about the different types of analyses that can be used on a 2x2 contingency table and when different analyses should be used. To open, I'll note that this stems from my ...
1
vote
1answer
58 views

Why use chi-square (or other) statistic over regression modeling for 2x2 contingency tables?

I have a question regarding the use of logistic/log-linear regression vs. contingency test statistics, such as chi-square. Can someone explain to me why it would ever be preferable to use test ...
1
vote
0answers
31 views

How to report log linear models of contigency tables

I am using log linear models (loglm function, library MASS of R) to evaluate if 3 variables ...
0
votes
0answers
14 views

Independent Categories with multiple responses, chi-square too simple, MRCV log-linear model too complex?

Hello all and thanks in advance for your consideration, My research question is simple: Do lynx have a different diet in summer compared to winter? Data structure looks simple at first glance, ...
1
vote
0answers
62 views

Testing specific categories after Fisher's exact test in 2 x k tables

I have two variables, one with 2 categories and one with 6 categories. To test, whether there is any relation between these variables, I performed Fisher's exact test, which gave a significant result. ...
2
votes
1answer
179 views

Why use G-test and the likes for AB testing at all?

I am learning about AB testing using the G-test. In my example, I have a 2x2 contingency table. ...
1
vote
2answers
79 views

Multiple testing: contingency table or logistic regression approach for survey?

I have a survey asking a person's gender (M/F), geographic region (West, East, Midwest, South) and a few other demographic variables along with two dozen questions in which they can disagree / ...
0
votes
1answer
29 views

Using split function in contingency table [closed]

I am quite beginner in R and I want to do a task that I think is manageable but I am still figuring out how. I have a contingency table like this: ...
2
votes
0answers
89 views

Contingency tables, Chi-Squared analysis and next steps in R

I'm hoping one of the more experienced R programmers/statisticians out there can help me with something, or explain why what I'm trying to do is stupid :-) In the past, I've done analysis of survey ...
0
votes
0answers
36 views

Which contingency method to use with a 3x3 table yet still account for expected or discrete choice?

Im not sure what test to conduct when I have 3x3 matrix of data and still account for availability. So, in a simple chi square you have an observed observation and then you are often able to ...
0
votes
0answers
21 views

Help with calculation of crossing more than expected from observed vs simulated data

I want to know if moose are crossing water more than expected. I followed the methods written in Beyer et al 2013 which I am now completely confused as to how to actually do the analysis. I am ...
1
vote
1answer
32 views

Coerce contingency table to report unrepresented classes [closed]

I have a contingency table computed from the out of sample observations. In some cases not all classes are represented in the out of sample and hence do not appear. I want to coerce the contingency ...
0
votes
0answers
51 views

Model selection of multinomial logistic regression for 2x3 contingency table

I want to analyze a 2x3 contingency table using multinomial logistic regression and I hope to be able to do it in Matlab or in R. I have looked around in old threads, but haven't been able to find a ...
0
votes
1answer
46 views

Alternative to Chi-Square, etc for categorical variables

I am trying again to explain my problem, and I have more concrete results. I have tried every potentially relevant test I can find, and none seem to work quite right. The question is illustrated ...
0
votes
0answers
46 views

Probability of Event from a table

I have the following table: From here I want to answer the following question: P(CHILD CAN RECOG BEG SOUNDS OF WORDS – YES | CHILD RECOGNIZES LETTERS - Most of them). From my understanding of ...
1
vote
1answer
89 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 ...
0
votes
1answer
238 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 ...
7
votes
2answers
287 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 ...
0
votes
0answers
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 ...
0
votes
0answers
36 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 ...
1
vote
1answer
38 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 ...
1
vote
1answer
48 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 ...
3
votes
1answer
685 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 ...
1
vote
0answers
34 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 ...
0
votes
0answers
20 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 ...
1
vote
1answer
145 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 ...
2
votes
2answers
124 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 ...
2
votes
0answers
49 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 ...
0
votes
1answer
47 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: ...
0
votes
1answer
93 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 ...
1
vote
0answers
52 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 ...
0
votes
0answers
123 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 ...
0
votes
0answers
25 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. ...
1
vote
1answer
108 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 ...
1
vote
1answer
1k 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 ...
2
votes
1answer
854 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 ...
3
votes
2answers
185 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 ...
1
vote
1answer
355 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 ...
0
votes
1answer
113 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 ...
0
votes
1answer
159 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 ...
6
votes
2answers
254 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 ...
2
votes
4answers
304 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? ...
1
vote
0answers
58 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 ...
1
vote
0answers
64 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 ...
3
votes
1answer
111 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?
2
votes
1answer
100 views

Goodness-of-fit for contingency tables

I have a question on testing mortality table. Suppose I am given a simple mortality table: ...
2
votes
1answer
163 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 ...
10
votes
1answer
201 views

What is contingent in a contingency table?

The Merriam-Webster dictionary defines a contingent event or situation as ...
3
votes
1answer
382 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 ...