423 views

### chi square test for 6X4 contingency table [duplicate]

i wanted to find out the association between two variables and it reduced to 6X4 contingency table. grand total is 103. the spss output of chi square test displayed "82.1% cells have expected count ...
13 views

### Test if the probability of two events occurring are equal [duplicate]

Suppose I have two independent events that occur with unknown probabilities. For example, I have two buttons, and each time I press a button there is an unknown chance that it will make a noise. I ...
4k views

### What are some examples of anachronistic practices in statistics?

I am referring to practices that still maintain their presence, even though the problems (usually computational) they were designed to cope with have been mostly solved. For example, Yates' ...
60k views

### Fisher's Exact Test in contingency tables larger than 2x2

I was taught to only apply Fisher's Exact Test in contingency tables that were 2x2. Questions: Did Fisher himself ever envision this test to be used in tables larger than 2x2 (I am aware of the tale ...
4k views

### Contingency tables: what tests to do and when?

I'd like to see an extension of this discussion of the age-old chi-sq vs. Fisher's exact test debate, broadening the scope a bit. There are many many tests for interactions in a contingency table, ...
10k views

### Alternatives for chi-squared test for independence for tables more than 2 x 2

What are some alternatives to the chi-squared test for categorical variables with tables larger than 2 x 2 and cells with a count less than 5, if I don't want to merge classes?
6k views

### For chi-square on any 2 by X contingency table, should no more than 20% of the cells be less than 5?

In their 1999 book, Yates, Moore & McCabe specify that no more than 20% of expected counts should be less than 5 and all individual expected counts should be greater than 1. Does this mean that, ...
2k views

### Is the chi-squared test appropriate with many small counts in a 5x2 table?

I have two sample populations, A, and B, which are independent. ...
7k views

### Chi Square Test for Independence in R and Python

Consider the following R code and output: ...
12k views

### R: prop.test - Chi-squared approximation may be incorrect

I am trying to compare the proportions of two populations, using prop.test My data is straightforward - first population is 6/26 and second is 15/171. I am trying ...
6k views

### Why do p values for test of likelihood ratio vs Fisher's Exact Test not agree

In a 2x2 analysis of categorical data, what causes the p value for the test of the likelihood ratio to differ from both the Fisher's Exact Test and the test of linear-by-linear Association? ...
630 views

### Chi-squared test: Investigating fruit flies attraction to different colours

I have a few questions about the Chi-squared test. First of all, this is what I was investigating: H0: Fruit flies show no difference in attraction to light of different colours Protocol: 20 fruit ...
3k views

### Post hoc chi-square test

I am looking at a $\chi^2$ (crosstabs) test looking at interactions between types of dyads in an animal group. My categories are Male-Male, Male-Female, and Female-Female dyads in the rows and "Were ...