Herman Rubin wrote:
>
> In article <[EMAIL PROTECTED]>,
> Jeff <[EMAIL PROTECTED]> wrote:
> >Hello,
>
> >Would like to ask the design of experiment gurus to help me with the
> >following questions:
>
> >1. why designs for experiments should be orthogonal ?
>
> The computations get easier.
Also, the interpretation is usually more straightforward.
> >2. which problems may I encounter if I use non-orthogonal design ?
>
> The nice simple ANOVA procedures are no longer valid.
> This does not mean that nothing can be done.
You may also encounter software that analyzes the data improperly!
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