Data Collection and Analysis

Once a perceived problem is identified, data must be collected and analyzed (Steps 2 and 3 of the previous procedure). This process involves the steps listed in the table below.
Collecting and Analyzing Data
Step
Action
Notes:
1
Identifying data sources
See “Data Sources” later in this section.
2
Collecting data
See “Data Sources” later in this section.
3
Determining an analysis strategy (How best to determine if a problem exists.)
See “Data Analysis and Interpretation” later in this section.
4
Analyzing data
See “Data Analysis and Interpretation” later in this section.
5
Displaying and reporting analysis results
For example, a graph or chart may display the data over time to show that the problem is either increasing or decreasing in frequency.
6
Identifying high-incidence crash locations
Of all crash locations in a jurisdiction, are there any that appear more frequently than others?
7
Identifying overrepresented crash characteristics
For example, youth with alcohol involvement. See “Data Elements” later in this section.
8
Analyzing support problems (Who has the information you need? Will they share it? Is the data reliable?)
Attempt to solve data access problems by enlisting the support of agencies or offices that collect or possess the information you need. See “Data Sources” later in this section.