Statistics 100A, Fall
Interim report due
Final report due D
The data set tree failure contains information on failures in Quercus
lobata also called
The data set contains the following variables:
type of failure (branch, trunk or root failure)
variables related to trunk failure
height of trunk at which failure occurred
diameter of the trunk at which failure
whether or not the failed portion of the tree is dead (y/n for yes/no)
whether or not there is decay
whether or not the tree has an uncorrected lean
whether or not there are cracks in the trunk
whether or not there is mechanical injury to the trunk (y/n)
whether or not there is animal injury to the trunk (y/n)
whether or not there is insect injury to the trunk (y/n)
variables related to branch failure
whether or not the canopy has been cleaned (y/n)
whether or not there has been thining of branches (y/n)
variables related to root failure
the moisture condition of the root at the time of failure
general variables related to the trees
age of tree
height of tree
diameter of tree at base height
wind speed at time of failure
temperature at time of failure
precipitation at time of
cost of the clean up after failure
provide a description of all variables; if the variable is continuous you
should obtain mean and standard deviation and five number summaries. For qualitative
variables you should provide
frequency tables. The interim report should be about 2
pages, single spaced or 1.5 line spacing. Do not use double spac
ing. The rep
ort is due
on November 2
. No late report will be accepted.
nal project: it is due on December 4
, no late projects accepted. Answer
Is there an association between age, height or dhb and type of failure?
Does wind speed make any difference in the type of failure?
Does precipitation make any difference in the type of failure?
Is temperature related to type of f
Which type of failure had the costliest clean up?
Describe moisture conditions at time of root failure. Did more trees experience
root failure when it was dry or after rain, when the ground was wet?
For branch failures was it more or less likely th
at the tree had been thinned or
Provide information on the height and diameter at which the trunk failure
occurred in the trees that experienced a trunk failure.
Did a majority of trees have mechanical, insect or animal injury that experienced
What other conditions were notable in the trunk failures such as cracks, lean
decay? What about the crown,
was it dense?
For trunk failures is there an association between decay and whether or the
failed portion is dead?
For branch failur
e is there an association between cleaned and thinning?
For root failures, is there an association between the moisture condition and
You can answer these questions in the order you wish but it should be coherent. Your
final report should no
t exceed 5 pages, not counting graphs and other materials that you
may add as an appendix. Major graphs and tables should be in the report, however,
there should not be more than 2 or 3 tables at mo
st and graphs should be include
they serve to make a p
The report should contain the following sections:
a brief overview
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motivation of the analysis
the statistical methods used
your findings, this is the main part of the report
Appendix as needed
ou can work in groups of up to three people or you can work alone. If you work as a
group, you will submit only one report. The groups have to be determined by the time of
the interim report.
There will be no exception to the limit of three people per proj
after November 2