Thank you very much for this information. It will be very useful for
me.
Best regards,
AB

--- In DOE_DG@yahoogroups.com, "yn2rkr" <rkr@...> wrote:
>
> Reply to "annamb5" <anabras@...>'s questions.
>
>
> Q1.Supposing that factor interactions were not included in the
> design.
> When doing ANOVA table (with QT4 soft)does the error percent
> influence
> also combines the effects of those interactions?
>
> Ans. Yes. The effects of interactions will also be combined with
the
> effects you find for factors. This would be very common unless you
> can afford to run full-factorial tests.
>
> Q2.In the previous situation, if the confirmation test result (to
the
> optimum solution)is within the confidence interval does it means
that
> there are no interaction factors in that situation?
>
> Ans. If the mean of samples tested at the optimum condition
> (confirmation tests) falls within the confidence interval, it does
> not imply that there is no interaction. It simply means that you
rae
> within your predicted performance in the presence of interaction.
>
> Consequently, it means that the interactions are small and/or they
> nullify each other resulting in total effects that is small.
>
>
> Q3.When applying the automatic test of the presence of interactions
> how
> can I know what factors are significant or not?
>
> Ans. You have no way to know that. Only way to learn about the
> relative influence of interaction is to sacrifice column to study
> interaction. So, what does the SI-interaction (in Qualitek-4
> software, www.nutek-us.com/wp-q4w.html ) information tell you or
when
> can you use it? You can use this information only for future repeat
> tests in deciding which interactions to study should you have
emplty
> column to study interaction.
>
> Hope this would be of help to you.
>
> Good luck.
>
> - RKR 9/9/08
>