This time there is only one of them and that is also

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 sign right at the top.  This time there is only one of them and that is  also correct.  In the final red box on that line type the number 7.  Your formula so  far should read, If GROUP = 1 then Nonsense = 7.  That takes care of the Normal  children. 4. To recode the Disordered children, click in the box called “else clause” and make it  red.  Again click on Nonsense in the  Table Columns , click on  Assignment  and  after the = sign type 268.  You got it.  We are recoding the Disordered children with  the number 268.  Your Formula Box should look like the one below. 4
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5. Click OK and OK, and if you did everything right you should have a new set of  codes. Analyzing Nonsense 1. To perform this analysis, you need to do the same basic things you did before, but  substitute Nonsense for GROUP.  Just go to  Analysis Fit Y by X, Fit the Mean,  and  Fit the Line .  Whoa!  That sure looks different. The line slopes downward  indicating an inverse relationship.  Look at the formula for the Linear Model. MOVS = 6.8214815 – 0.0042593 * Nonsense 2. Can this be right?  The regression coefficient,  B , is –0.004.   Remembering our  conceptual definition of  B  is:  The amount that Y changes for each unit of increase in  X.   So  Y  decreases .0042593 units for each unit that  X  increases.  Does that make  sense? 5
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3. Let’s try an experiment.  One way to check this is to see if the Y-hats turn out to be  the same.  If so, then we can delve a little deeper.  Click on the  Red Diamond  by  “Linear Fit” and select  Save Predicteds .  They’re the same all right.  Let see how  that can be. 4. Using a calculator (if you don’t have one with enough decimal places, use the one on  your computer), multiply  0.0042593 * 7 and subtract that from 6.8214815.  You  should get 6.79, which is the mean for the Normal children.  Now multiply  0.0042593 * 268 and subtract it from 6.8214815.  You should get 5.68 or the mean  for the Disordered children.  Looks like this works.  5. Here are some questions for you to answer.  Why is the regression coefficient and  the line-of-best-fit negative or inverse?  Think about that seriously and write your  answer in your Word documents.  When you are finished, save your document and  submit it to Sakai for evaluation. Conclusion This has been a lengthy assignment, but hopefully you have a firmer grasp of some  principles and concepts than you had before.  Also, you now know that when we are using  nominal codes to carry group membership information,  any number will do as long as  everybody in the same group gets the same number.   6
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  • Winter '08
  • Signorielli,N
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