One-way Analysis Of Variance

The One-way Analysis of Variance dialog generates a simple analysis of variance (ANOVA) table when there is a grouping variable available for the data defining separate k-samples of the data. The included F-statistic tests whether the mean values for all of the groups are equal. This assumes that the observations are normally (Gaussian) distributed.

For more complex models or ANOVA with multiple predictors, use the ANOVA dialog.

To perform a one-way analysis of variance

Choose Statistics __image\ebd_ebd29.gif Compare Samples __image\ebd_ebd30.gif k Samples __image\ebd_ebd31.gif One-way ANOVA. The dialog shown below appears.

__image\aov1way.gif

The One-way Analysis of Variance dialog has the following options:

Data

Data Set

Select a data set from the dropdown list or type the name of a data set. You can also type into the Data Set edit field any expression that evaluates to a data set.

Variable 1

Specify a column as the first sample, when the data set does not have a grouping indicator.

Grouping Variable

Specify a grouping variable to use when resampling observations.

Results

Save As

Enter the name for the object in which to save the results of the analysis.

Print Results

Select this to print out the results of the analysis in the designated output window.

Related S-PLUS language functions

aov, lm, menuOneway