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The survey, the 2002 Vehicle Dependability Index Study by J. D. Power & Associates, is based on responses of more than 30,000 original owners of 1998 model vehicles.
The observations are backed up Power's Vehicle Dependability Index, a survey of 30,000 original owners of vehicles four to five years old.
The study, previously called the Vehicle Dependability Index, was redesigned for 2000 and expanded to include 137 problems, allowing consumers to describe more fully almost any problem they had experienced, J. D. Power said.
It has also won J.D. Power's Vehicle Dependability Index study every year it has been eligible.
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Russ Kinnel, director of fund analysis for Morningstar, said the dependability of index funds gave an investor the freedom to own bolder funds, which he also owns himself.
The denominator is constant resulting in a high dependability of this index to system availability.
If one's interest lies in the absolute standings to a criterion (absolute decision), the index of dependability Ф reflects the score dependability.
G-coefficients and index of dependability (Ф coefficients) confirmed the reliability of the scale further with more exact variance components.
The G coefficient was.76 and index of dependability was.72.72
The results showed that increasing the number of tasks had a larger effect on the G coefficient and index of dependability than increasing the number of raters.
The index of dependability is expressed as: phi =frac{sigma_p^2}{sigma_{abs{sigma}^2abs}{2}=frac{sigma_p^2}{sigma_p^2+frac{sigma_r^2}{n_r}+frac{sigma_{pr,e}^2}{{n_r}_t}} (3)where ( {sigma}_{abs}^2 ) is absolute error and all other terms have been defined above.
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