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Topic 9

Section outline

  • Topic 9

    Topics:
    • Analysis of variance with two random factors.
    • The two-way mixed model.
    • Three-way analysis of variance.
    • Response curves and surfaces.
    Read: Montgomery, Sec. 13.1-13.3, 5.4, 5.5.

    Location: Niels Jernes Vej 14, room 3-119

    Remarks:

    • For the mixed model, Sec. 13.3, the unrestricted model seems more natural than the restricted one. To me the restricted model is an artifice to avoid negative variance components.
    • If a negative variance component occurs in an unrestricted mixed model, there is no problem if it is non-significant. Just remove it from the model. If significant, modelling requiring the multidimensional normal distribution is required.

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