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The recommendation is that when the Levene’s test is significant (indicating a violation of the assumption of homogeneity of variance), then use Brown & Forsythe’s test and if this is also significant, then accept and report the results of the latter.
![how to test the homogeneity of slopes using spss version 25 how to test the homogeneity of slopes using spss version 25](https://www.researchgate.net/profile/Lea-Pillette/post/How-to-interpret-SPSS-output-of-ANCOVA-with-repeated-measures/attachment/5d64ecc03843b0b9826141f5/AS%3A796430750982144%401566895296116/image/Analysis.png)
MANOVA), it involves variance/covariance matrices so we need to use the Box’s M test to test for homoscedasticity.
![how to test the homogeneity of slopes using spss version 25 how to test the homogeneity of slopes using spss version 25](https://slideplayer.com/13710461/85/images/slide_1.jpg)
With a multivariate procedure (where we have more than one metric dependent variable, e.g.
![how to test the homogeneity of slopes using spss version 25 how to test the homogeneity of slopes using spss version 25](https://pltfrmrsrcs.sagepub.com/sk/images/a-conceptual-guide-to-statistics-using-spss/9781412974066-p206-2.jpg)
Once you’ve got the variable you want to test for normality into the Dependent List box, you should click the Plots button. However, since we can perfectly well test for normality without adding in this extra complexity, we’ll just leave the box empty. In our example, Dog Owner, our independent variable, has two levels – owner and non-owner – so we could add Dog Owner to the Factor List box, and look at our dependent variable split on that basis. The Factor List box allows you to split your dependent variable on the basis of the different levels of your independent variable(s). You can either drag and drop, or use the blue arrow in the middle. To begin, click Analyze -> Descriptive Statistics -> Explore… This will bring up the Explore dialog box, as below.įirst, you’ve got to get the Frisbee Throwing Distance variable over from the left box into the Dependent List box. Our example data, displayed above in SPSS’s Data View, comes from a pretend study looking at the effect of dog ownership on the ability to throw a frisbee.įrisbee Throwing Distance in Metres (highlighted) is the dependent variable, and we need to know whether it is normally distributed before deciding which statistical test to use to determine if dog ownership is related to the ability to throw a frisbee.