How is the proportion of variation explained by each variable calculated in DISTLM marginal tests?

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Mathieu Cusson

Dear Pedro, Do you mean in the sequential tests section? In marginal tests I would assume that the value of "Prop." is simply the ratio of SSreg on SStot. I never observed a "Cumul." (of prop) reaching value close to one. However in the cumulative percentage explained by axes in the RDA, the % can get above 100 (but always got back to 100% when all axes are considered). Marti can explain you well this behavior. I hope this help a little. Regards.

Pedro Range

I was refering to sequential tests, where each variable is considered separatly. It is now clear to me that there is no logic in adding up the "Prop." values in these tests (that is probably why the cumulative values are not included in the output), thank you for pointing this out Sokratis. When the RDA axis are considered, the cumulative percentage explained is always less than 100, as Mathieu mentioned.

Thank you both for the very helpfull replies. Best regards