CE4001 Transportation Safety
1
CE4130 Transportation Safety:
Review of Statistics
CE4001 Transportation Safety
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A Note on Class Slides
Class slides are different from a formal
presentation:

15x2 or ~30 lectures during the
semester

Translated from previous lecture notes

Should not be a template for your
presentations

Better instructions will be given for your
topic presentations
CE4001 Transportation Safety
3
Preliminaries
{
I am assuming that all of you have had
some background in statistics:
z
Ugrads: CE3010 Decision methods
z
Grads: stat class from ugrad or currently
taking grad stats
Review is not comprehensive, but a quick
refresher on the most important
concepts of statistics for transportation
safety.
CE4001 Transportation Safety
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Selected References
{
Keller and Warrack (1997) Statistics for
Management and Economics.
Duxbury Press.
{
Transportation Research Board. (2001)
Statistical Techniques in Highway Safety
Analysis.
NCHRP Synthesis 295.
http://trb.org/publications/nchrp/nchrp_syn_
295.pdf
{
StatSoft, Inc. (2003) Distribution Tables.
http://www.statsoft.com/textbook/sttable.ht
ml
.
CE4001 Transportation Safety
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Terminology
Statistical terms
:
{
Population
{
Parameter
{
Sample
{
Statistic
Warning: multiple def’s apply to this,
even in the context of stats.
Watch the context!
CE4001 Transportation Safety
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Population
{
a set of
all items of interest
, does not
necessarily have to refer to people
{
(e.g. all cars that travel on I70 through
Columbia)
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CE4001 Transportation Safety
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Parameter
{
descriptive measure of the
population
{
(e.g. average: traffic flow, speed,
headways)
CE4001 Transportation Safety
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Sample
{
set of data drawn from the population,
or a subset of the population
z
Typically we want samples to be
representative of the entire population
(more later in inference)
{
(e.g. cars that traveled on I70 through
Columbia between 4pm and 5pm on
Wednesday)
CE4001 Transportation Safety
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Statistic
{
descriptive measure of the sample
{
(e.g. average: traffic flow, speed or
headway on I70 45pm on
Monday)
CE4001 Transportation Safety
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Terminology Illustrated
Discover6sigma 2009
CE4001 Transportation Safety
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Quick Def. Check
What is the parameter, sample and statistic if the
population is “annual traffic fatalities in MO 2000
2009”
{
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 Spring '11
 Dr.Siam
 Statistics, Standard Deviation, Transportation Safety, Transportation Research Board.

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