Fisher exact test

Fish·er ex·act test

(fish'ĕr),
the test for association in a two-by-two table that is based on the exact distribution of the frequencies within the table.

Fish·er ex·act test

(fish'ĕr eg-zakt' test)
Statistical significance assessment that uses a two-by-two table that is based on the exact distribution of the frequencies within the table.

Fisher exact test

[R. A. Fisher, Brit. mathematician, 1890–1962]
A test used to determine the statistical significance of findings generated from small sets of data.

Fisher,

Ronald A., English statistician, 1890-1962.
Fisher exact test - a statistical hypothesis test.
References in periodicals archive ?
Statistical analysis was performed with the Fisher exact test or the [x.sup.2] test for comparison of ratios, the t-test for comparison of mean differences of continuous variables, and the Log-Rank test for comparison of Kaplan-Meier plots.
Descriptive statistics was employed for distribution of data obtained in the patient sample, whereas Pearson's [chi square]-test, Fisher exact test and multivariate analysis of binary logistic regression were used on correlation of the results obtained.
Using the median distance to closest margin of the frozen section group (3.0 cm) as a reference point, we observed a statistically significant increase in the percentage of cases in the gross examination group with a distance to the closest margin of more than 3.0 cm: 12 of 26 cases (46%) in the frozen section group, compared with 86 of 118 cases (73%) in the gross examination-only group (Fisher exact test, P = .01; Table 3).
The number of patients with no necrotic tissue are significantly higher in the test group at 3rd week follow-up (p < 0.001), at 4th week (p < 0.001), at 5th week (p < 0.001), at 6th week (p < 0.001) and at the 7th week (p < 0.01) when compared to control group as per the Chi-square/ Fisher Exact test (shown in Table No.
The Fisher Exact Test was used in the case of simple Chi-Square test when the last condition has been violated.
A Fisher exact test for 2 x 2 contingency tables was used to compare dilated pupil diameters and PL ratios by the presence or absence of general conditions (diabetes mellitus and hypertension) between the groups.
Rates of positive viral RNA detected from oropharyngeal, cloacal, or visceral cavity samples of chicken carcasses sold at the retail markets were 20% higher than were those collected from the dressed poultry stalls (all p<0.1 by Fisher exact test) and >50% higher than those collected from the supermarkets (all p<0.002 by Fisher exact test) (Table 1).
After generating the nondominated SNP subset, we apply Fisher exact test [29, 30] to the dataset containing nondominated SNP generated in the algorithm first stage.
Student's t-test, chi-square test (and Fisher exact test), and Spearman correlation analyses were performed to compare sexes, groups, and the effect of select radiographic criteria.
Chi-square is used frequently with larger samples when results should be similar to the Fisher's test, but the Fisher exact test also can be used with larger samples.
The prevalence of microdeletions was assessed using PCR in AZFc area of V chromosome and statistical analysis was done using the Fisher exact test and Pearson correlation.