|DataLab is a compact statistics package aimed at exploratory data analysis. Please visit the DataLab Web site for more information....|
|Home Features of DataLab Mathematical/Statistical Analysis Statistics One-way ANOVA|
|See also: Statistical Tests
The command Math/ANOVA/One Factor... performs a one-way ANOVA. You have to select two columns, one containing the treatments, the other containing the dependent variable. When both columns have been selected the results of the ANOVA is displayed (SS stands for sum of squared residuals, DF for degrees of freedoms, and MSS for the variances).
In order to test whether at least one mean of the treatments differs from the others, you have to compare the calculated F-value to the critical F-value. The level of significance can be set at the lower right of the window.
The prerequisite of equal variances can be checked by Levene's test. The null hypothesis of equal variances has to be rejected if the F value exceeds the critical limit.