Symptoms
You cannot find the Help for the ANOVA function.
Cause
In Microsoft Office Excel, there is no built-in ANOVA function or corresponding Help.
Resolution
Although there is no ANOVA function, there are several Anova tools in the the Analysis ToolPak, along with other tools, that help you perform a wide variety of statistical and engineering analysis tasks.
For more information about how to load and use the Analysis ToolPak, see Perform statistical and engineering analysis with the Analysis ToolPak.