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This nonparametric analysis allows me to test whether the effect of the covariates is proportional over the entire baseline as the Cox proportional hazard model requires.
The study did not formally test whether the effect of migraine (with and without aura) on ischemic stroke was modified by HC intake status.
We also interact that indicator with the four distance measures and test whether the effect of distance on marital stability differs for the two groups.
An interaction term for height class × treatment was added to Model (5) to test whether the effect of stem bending on Type 1 resin pocket formation varied with height in the treatment year (2007 2008).
As an extension of the basic models given by equations (1) and (2), interaction terms were included in the models to test whether the effect of turnover on employer-provided CVT varies between certain groups of firms.
To test whether the effect of BMI on hours of work is different in single and married respondents, we pooled the single and married samples, separately for each ethnic group, and included married status and an interaction between marital status and BMI in OLS regressions.
The dummy variable temporary is excluded from the set of controls in order to test whether the effect of this variable on the test scores is mainly due to the amount of OJT workers receive at the workplace, and not to any other channels related to holding such contracts.
This method, developed by Firpo et al. (2009), allows us to test whether the effect of BMI varies across the unconditional hours of work distribution.8 In addition, UQR can help determine whether the positive association between BMI and hours of work is related to a health insurance motive.
This allowed us to test whether the effect of plate make on the crystallisation fraction varied according to protein.
An additional active control TMS condition was included to test whether the effect is specific to the targeted region.
The main advantage of a flow chamber system is that it allows to test whether the effect of given chemical is reversible.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com