• Hi Robert. It’s been a long time since I opened this account. I just would like you to know you’ve been a great part of the whole journey. I finally graduated last year! Thanks for all the help! :D 6 months, 4 weeks ago

  • My study has multiple responses and for me to get the best result, I considered using a desirability function as an objective of the experiment. My question is, how will I know that there is no premature convergence happening? Thank you in advance for the help! 2 years, 5 months ago

  • Hi Robert,

    I was actually waiting for your response. Thank you very much! Yes, I actually removed the ctr point term in my equation. This is the resulting regression equation. However, I am not sure how the term for the ct. point would be of use.

    Y= -0.144 + 0.3177 A + 0.1662 B – 0.04065 AB + 0.560 Ct Pt

    I have also read in other post that when…[Read more]

  • I am using a factorial design (2 factors 2 levels) with center points. After running ANOVA, I found the following:

    1. Main factors were not significant. Only the interaction and the curvature were significant. What should be the model for this? Should I keep all the terms or should I only be keeping the interaction term? y = -0.144 + 0.3177A +…

    [Read more]

  • @rbutler

    if the experiment is preliminary, which one is better to conduct?

    1. two level factorial with center point replicates
    2. go directly to three level factorial

    Thank you! 3 years, 9 months ago

  • yes, you are right. i am going to validate the entire model, not just the center points. Thank you for your inputs! 3 years, 9 months ago

  • If I am going to replicate every thing, I will have 5 experimental runs right (multiplied by 3)? 3 years, 9 months ago

  • @rbutler

    these are currently my objectives:

    1. Investigate the main effects and interaction effect of (1st factor) and (2nd factor) on the response;
    2. To obtain mathematical models that can predict the response through multiple linear regression analysis using (1st factor) and (2nd factor) as predictor variables;
    3. To test model for…[Read more]

  • hello! thanks for the reply. right now, im currently pursuing two level full factorial with centerpoint. and yes, my variables are continuous.

    however, im not really sure of the process. is the model im gonna come up is still linear? and then ill just be doing a follow up check whether there is curvature? im thinking this is the sequence:

    1.…[Read more]

  • I’m new to DOE. I’m doing a full factorial design.

    In my case, I have two factors each with 4 levels.

    I want to know the main effects and the interaction effects, and establish an equation to predict the response.

    However, I have seen in most examples that there are only 2 levels (high and low).

    With this, I would like to ask if is…[Read more]

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