The F value is 0.023 with a p-value of 0.977. The interaction term fert* initial shows no evidence of violation of the equal slopes assumptions. Does the interaction term fert* initial show any evidence of violation of the equal slopes assumption? To produce the output, after creating the data file, from the menus choose:Įxamine the output table Test of Between-Subjects Effects and try to interpret it. Using the information on Table 1 above create an SPSS data file.
The interaction term provides the test of the null hypothesis of equal slopes.
This can be tested by fitting a model containing main effects of fert and initial, as well as the fert* initial interaction. This is known as assumption of equality (homogeneity) of regression slopes. Testing Assumptions: Homogeneity of Regression Slopesīefore we can start the analysis, we need to check the assumption that the regression of final height on initial height is the same for all three types of fertilizer.
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