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He proposed a velocity squared term to account for this non-linearity.
As mentioned before, we also test for non-linear effects by including a squared term.
Xu-Long et al. in their study found the exact solution for radial fluid flow along with pressure squared term.
They also proposed the analytical solution using Hankel transform for fluid flow in spherical state when the pressure squared term is included.
Four gall types showed significantly nonlinear relationships, incorporating a significant Budburst squared term.
In both samples, the best fitting model included a squared term for age.
We evaluated the improvement in model fit upon incorporation of a polynomial (i.e., squared) term into the model using the likelihood ratio test.
(We restrict HRH interactions to the time trend main effect and omit interactions with the time trend squared term; our specification is based on our findings that no HRH density-time trend squared term interactions are significant either individually or jointly) This is motivated by our previous observation of the financial crisis and policy changes that took place during our study period.
To formally test whether the association between length of stay and death within 30 days of discharge was linear, we also included length of stay as squared term in the fully adjusted statistical model.
Because the relationship between prior- and current-year costs may not be strictly linear [ 45], we also examined a functional form that included a squared term of costs in 2006.
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For example, squaring all 15 domain scores of the QLQ-C30 is one possible choice, as is squaring 14 and have only one non-squared term remaining.
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CEO of Professional Science Editing for Scientists @ prosciediting.com