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composite variable
This paper investigates linear approximations to the recently popular quadratic almost ideal demand system (QUAIDS) by proposing a new composite variable and conducting a simulation study.
      
The new composite variable performs well in combination with the price indices appropriate for linearizing the almost ideal demand system.
      
In this framework, a sliding variable is defined as a composite variable (a combination of the instantaneous tracking error and its temporal derivatives) that fulfills a specific stability criterion.
      
A peak of correlation was found for a physiologically plausible reaction time, corresponding to a stable composite variable.
      
These findings suggest that, during visually guided movements, human subjects attempt to minimize such a composite variable and not the instantaneous error.
      
An overall measure of Cooper's-hawk-induced risk (a composite variable of attack rate and activity patterns) generally reflected the timing of prey activity, with peaks occurring around sunrise and sunset.
      
Analysis showed statistically significant differences with regard to the unemployment history of the mother's supporter, the nutritional value of the mother's diet, and a composite variable indicating social risk.
      
Stream order was strongly and significantly positively correlated with species richness (P >amp;lt; 0.001), but was in effect functioning as a composite variable.
      
For maternal diet, a composite variable was created that consisted of 10 foods identified a priori as containing DNA topoisomerase II inhibitors.
      
A composite variable, termed the exposure index, was derived from all the site structure characteristics using an ordination and was found to be useful in explaining species distribution.
      
Total species richness was best explained by a composite variable (PCA) describing physical habitat heterogeneity, species richness being lowest in small bog lakes with simple bottom structure and low amount of aquatic plants.
      
Alcohol consumption significantly increased the odds of having sex and had a significant positive association with the sexual risk composite variable.
      
A composite variable for mothering predicted 11% of the variance in children's relational bullying.
      
A composite variable made up of loans for buildings, construction, and housing was found to be less appropriate.
      
A composite variable denoting problem drinkers was defined as a positive response at either time point for either of the 2 indicators.
      
A composite variable measuring overall parent conflict was created on the basis of these 3 variables.
      
A minimum loading of 0.40 was required to be retained in the composite variable.
      
All seven items were standardized prior to summation to form a composite variable, perceived control of bullying.
      
As the data was non-normal and the sample size was small, the data was collapsed so a single composite variable represented each construct.
      
Because PCs are a composite variable, shape changes are analyzed in PCs as a movement of a set of landmarks.
      
 

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