T If you are performing a correlated- samples analysis, also make sure that the values for each sample are entered in the appropriate sequence. An updated version of this page, allowing more than 10 groups, graphic data visualization and sortable Tukey HSD output available here. T For each sample, make sure that the final entry is not followed by a carriage return. Importing data via the copy and paste procedure will almost always produce an extra carriage return at the end of a column. Desired confidence level for post-hoc confidence intervals: This web page performs a one-way ANOVA from summary data -- that is, from the counts, means, standard deviations or standard errors for each group.
This might happen, for example, if you're analyzing data that has been summarized in a book or published article.
Note that a correlated- samples analysis presupposes equal numbers of observations for each sample in the analysis. Importing data via the copy and paste procedure will almost always produce an extra carriage return at the end of a column. If you need to evaluate more than 10 groups go here. You can also put short meaningful group names into the first column, replacing the generic "Group 1", "Group 2", etc. Enter them in the table below, replacing the sample data that's in the table.