2
Variable: any characteristic, number, or attribute that can be measured or counted Numeric variables have values that describe a measurable quantity as a number, like 'how many' or 'how much' May take any real number value (continuous) or only whole number values (discrete) The data collected for a numeric variable are quantitative data 3
Variable: any characteristic, number, or attribute that can be measured or counted Categorical variables have values that describe a 'quality' or 'characteristic' of a data unit, like 'what type' or 'which category' Categories should be mutually exclusive (in one category or in another) and exhaustive (include all possible options) May have a natural order (ordinal) or not (nominal) The data collected for a categorical variable are qualitative data 4
Source: Australian Bureau of Statistics,
Source: The Association of Faculties of Medicine of Canada (2013), CDC (2013) 6
Source: The Association of Faculties of Medicine of Canada (2013), CDC (2013) 7
8
Source: The Association of Faculties of Medicine of Canada (2013) 9
Host = Pedestrians Agent = Kinetic Energy Environment = Physical & Sociocultural Vector = Vehicles 10
Source: The Association of Faculties of Medicine of Canada (2013) 11
12
13
14
Source: The Association of Faculties of Medicine of Canada (2013) 15
16
Source: The Association of Faculties of Medicine of Canada (2013) 17
Source: The Association of Faculties of Medicine of Canada (2013) 18
19
HostAgent or vector Physical environment Sociocultural environment Pre-event Event Post-event 20
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