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comparison of slopes from linear regression model

By Bob | Feb 05, 2018 12:20AM CET

How do I use xlstat to test whether the slopes of two regression models are different?

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By Sébastien | Feb 05, 2018 10:51AM CET | XLSTAT Agent

Hi,

The best way to compare slopes is to run an ANCOVA including an interaction effect between the quantitative and the qualitative independent variables.
If you only have two slopes, the interaction effect tests the null hypothesis that the slopes are equal.

Follow this tutorial and activate “Interactions” in the options tab.
https://help.xlstat.com/customer/en/portal/articles/2062234-ancova-analysis-in-excel-tutorial?b_id=9283

Jean Paul

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