PG851: GLM--ANOVA

This blog is for the use of students enrolled in either section of PG851. It is intended to be a forum for asking, discussing, clarifying, and helping.

Tuesday, February 02, 2010

Fmax and computing

I'm lost! How do we pull up the variance properly for the Fmax test? Do we have to split the file?

Second question: I'm confused on the computing the variable in order to perform a post hoc analysis...how do you do that?? As we've made only two groups w/Var A and Var E...does that mean we have 4 groups/cells?

Thank you!
Nikki

posted by Nikki Frederick @ 3:53 PM  

7 Comments:

  • At 6:21 PM, Blogger Mari said…

    Yes, to get the variances by groups, you must split the file.

    Please review your handouts on how to create the new variable. I'm pretty sure that with that to jog your memory, you will remember how we did it in class.

     

  • At 11:26 PM, Blogger David said…

    if that's confusing, you could square the SD to get the variance as well.

     

  • At 9:55 AM, Blogger Grace Liu said…

    theoretically, you can square SD to get variance, but you can also have SPSS do it for you.

     

  • At 8:24 PM, Blogger Mari said…

    Squaring the standard deviation is NOT your best option due to rounding errors.

     

  • At 9:39 PM, Blogger Nikki Frederick said…

    Thanks!

     

  • At 2:37 PM, Blogger Jay Wellman said…

    Im confused why would we be computing Fmax? Wouldn't you only need to check Fmax if Levene's was significant?

     

  • At 7:36 PM, Blogger Mari said…

    Yes, you would only compute Fmax if Levene's were significant.

     

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