Turbine controller DS200PCCAG8A has good pressure resistance
Technical data of product parameters
lead to biased estimates or model coefficients” (Elvik, 2011a, p. 256). One solution to this problem is to
use disaggregate data, such as hourly volumes instead of AADT, but that could require the analysis to
not only address the problems due to low sample mean (discussed earlier) and temporal correlation
(discussed below), but also to find a source for hourly volumes. For example, Lord et al., (2005) used
data on hour traffic volume from freeway sections in Montreal, Quebec, to examine the relationship
between crashes, traffic flow, density, and v/c ratio. Lord et al., (2005) used the generalized estimating
equations DS200PCCAG8A approach to address temporal correlation. Hierarchical Bayes models can also lead to
more stable parameter estimates and more accurate models with respect to both individual- and
aggregate-level performance (Orme, 2000).
Temporal and spatial correlationDS200PCCAG8A
Temporal correlation may arise if multiple observations are used for the same roadway unit. This
happens often when multiple years/months of data are used in the modeling because “many of the
unobserved effects associated with a specific roadway entity will remain the same over time” Lord and
Mannering (2010, p. 292). Temporal correlation can lead to incorrect estimates of the standard errors
of the coefficients. Temporal correlation can be addressed using a variety of methods including
generalized estimating equations DS200PCCAG8Ae.g., see Lord and Persaud, 2000), random effects models (e.g.,
see Shankar et al., 1998), and negative multinomial models (e.g., see Hauer, 2004). Ulfarrson and
Shankar (2003) in their study of median crossover crashes found that the negative multinomial model
outperformed the random effects model in terms of fit, but the negative multinomial model was more
difficult to estimate because of convergence problems.
Similar to temporal correlation, spatial correlation may occur because “roadway entities that are in close
proximity may share unobserved effects” (Lord and Mannering, 2010). Wang and Abdel-Aty (2006) used
GEE to account for spatial correlation in their examination of rear-end crashes at signalized
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