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Here the confounding effect of age was modelled using fractional polynomial regression[ 6].
A multivariable logistic regression analysis, using generalised estimating equations, was used to assess the association between volume, modelled using fractional polynomials, and ultimate acute hospital mortality while adjusting for potential confounders.
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BMI values at baseline age and at age 30 years were mutually adjusted in both the age-adjusted and multivariable models and were modelled as continuous variables using fractional polynomials (Royston et al, 1999) whenever this provided a better overall fit of the model calculated using the Akaike information criterion (AIC) (Akaike, 1974).
Transient thermal strain and basic creep strain are considered, the latter modelled using a fractional derivative creep law, to investigate the coupling effects of time, temperature and geometric non-linearity on mechanical behaviour and stability boundaries.
The public could save at least 5 billion by using fractional coins.
Fractional-order PID (FOPID) controller is a generalization of traditional PID controller using fractional calculus.
Fractional-order PID (FOPID) controller is a generalization of standard PID controller using fractional calculus.
Birthweight was regressed against gestational age using fractional polynomials [ 17].
Functional form was assessed using fractional polynomials [ 18].
Ratios are also sometimes expressed using fractional notation.
In order to account for a possible nonlinear effect of age, and for age being an effect modifier, age was also modelled using second-degree fractional polynomial terms.
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