accident_model
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開始行:
1. STATISTICAL SAFETY MODELING.
Abstract.
The hope is that by fitting multivariate statistical mode...
Success will be evident when several studies using divers...
1. INTRODUCTION
Statistical safety modeling (SSM) is the fitting of a (mu...
The data are about past accidents and traits for a set of...
A. To estimate the safety of an infrastructure element ba...
B. To estimate the safety effect of change in the traits ...
On the surface, the required computations are similar for...
Therefore, the difference between X and Y reflects partly...
Still, it would be surprising if the causal factors that ...
Many books have been written about multivariate statistic...
This is why, in this paper, the use of canned software is...
2. THE ELEMENTS.
The central element of SSM is the model equation; it is a...
3. THE MODEL EQUATION.
The generic model equation is where y denotes the expecte...
More popular nowadays are multiplicative models of the fo...
Figure 1. The shapes X$ can take.
Figure 2. The shapes e$X can take.
Second, the representation of road segment safety does re...
vicinity and not on, say, the overall length of the segme...
These considerations make it possible to suggest a model ...
In equation 2, y is the estimate of the annual number of ...
3.1 Choosing Variables and Functional Forms.
In building up the model equation, the role of each varia...
Table 1. R Ratios for Lane Width.
For each entity in a bin we have the recorded number of a...
When R(V)>1, too few accidents are predicted by the model...
Figure 3 R versus % Trucks.
If the points R(V) form an orderly relationship when plot...
In Table 1 there is no evidence of an orderly relationshi...
The progression of R’s appears to be orderly, even if une...
Figure 4. Multiplier for %Trucks variable
Case b. The variable is to be represented in the additive...
For all chosen values of V compute:
When R(V)>0 too few accidents are predicted by the model ...
When preparing the data for SSM, the data record is usual...
This generalizes as follows. Consider a segment which is ...
終了行:
1. STATISTICAL SAFETY MODELING.
Abstract.
The hope is that by fitting multivariate statistical mode...
Success will be evident when several studies using divers...
1. INTRODUCTION
Statistical safety modeling (SSM) is the fitting of a (mu...
The data are about past accidents and traits for a set of...
A. To estimate the safety of an infrastructure element ba...
B. To estimate the safety effect of change in the traits ...
On the surface, the required computations are similar for...
Therefore, the difference between X and Y reflects partly...
Still, it would be surprising if the causal factors that ...
Many books have been written about multivariate statistic...
This is why, in this paper, the use of canned software is...
2. THE ELEMENTS.
The central element of SSM is the model equation; it is a...
3. THE MODEL EQUATION.
The generic model equation is where y denotes the expecte...
More popular nowadays are multiplicative models of the fo...
Figure 1. The shapes X$ can take.
Figure 2. The shapes e$X can take.
Second, the representation of road segment safety does re...
vicinity and not on, say, the overall length of the segme...
These considerations make it possible to suggest a model ...
In equation 2, y is the estimate of the annual number of ...
3.1 Choosing Variables and Functional Forms.
In building up the model equation, the role of each varia...
Table 1. R Ratios for Lane Width.
For each entity in a bin we have the recorded number of a...
When R(V)>1, too few accidents are predicted by the model...
Figure 3 R versus % Trucks.
If the points R(V) form an orderly relationship when plot...
In Table 1 there is no evidence of an orderly relationshi...
The progression of R’s appears to be orderly, even if une...
Figure 4. Multiplier for %Trucks variable
Case b. The variable is to be represented in the additive...
For all chosen values of V compute:
When R(V)>0 too few accidents are predicted by the model ...
When preparing the data for SSM, the data record is usual...
This generalizes as follows. Consider a segment which is ...
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