Term project Statistics 100A, Fall 2015

The final report is due on December 4th, 2015, with an interim report due on November 2nd.
Information on Quercus failures can be found in the data set tree failure.

Also known as Valley oak, lobata.
The following variables are included in the data set:
Failure type is often known as branch, trunk, or root failure.
trunk failure-related factors include:
t fail height: The height of the trunk where the failure occurred.
diameter of the trunk where the failure occurred, or break-in
portioned: Indicates whether or not the branch that failed is dead (yes/no with y/n).
Lean: Whether the tree has an uncorrected lean (y/n) and whether there is decay (y/n).
cracks: Whether or not the trunk has cracks (y/n)
whether or not the trunk has been mechanically harmed (y/n)
Animal: whether the trunk has been harmed by an animal (y/n)
If there are any insect bites on the trunk, yes or no (y/n).
branch failure-related variables include:
if the canopy has been cleaned, it has been cleaned (y/n).
whether or not there has been a branch thinning (y/n)
root failure-related variables include:
moisture: the root’s moisture level at the time of failure
irrigation: watering the tree
general characteristics of trees
age :
Age of tree height, tree height at the base, and tree diameter at base height
wind speed at the time of failure
temperature: when the failure occurred.
precipitation: failure-related precipitation
Cleanup: The expense of failure-related cleanup
Describe each variable in the interim report; if the variable is continuous, collect its mean, standard deviation, and five summaries of the numbers. Frequency tables should be provided for qualitative variables. The interim report should be roughly two pages long, with 1.5 lines between paragraphs. Avoid using double spacing. November 2 is the deadline for the report. There is no tolerance for late reports.
Final project: no late projects will be accepted; it is due on December 4. Respond to the following inquiries:
• Is there a relationship between the type of failure and age, height, or DHB?
• Does the type of collapse depend at all on wind speed?
• Does precipitation affect the kind of failure in any way?
• Does the type of failure depend on the temperature?
Which kind of failure required the most money to clean up?
• Describe the humidity levels at the moment of root failure. Did more trees suffer from root failure when the ground was dry or when it had just rained?
Was it more or less likely that the tree had been cleaned or thinned when a limb failed?

Inform the reader of the height and diameter at which the trunk failure of the affected trees took place.
• Were there mechanical, insect, or animal injuries that caused the majority of trees’ trunks to fail?
• What additional issues, such as fractures, lean, or rot, stood out in the trunk failures? Was the crown dense? How about?
• Is there a correlation between decay and whether or not the failed piece is dead for trunk failures?
• Is there a correlation between cleaning and thinning for branch failure?
• Is there a correlation between precipitation and moisture conditions for root failures?
These responses can be given in any order, but they must make sense. Without taking into account graphs and other items you might include as an appendix, your final report shouldn’t be longer than five pages. The report should include significant graphs and tables, but there shouldn’t be more than two or three tables at a time, and graphs should only be included if they help to support a point.
The following sections should be included in the report:
a. Synopsis

concise summary
Introduction (b)

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analysis’s driving force c. Methods

the statistical techniques applied, d.

Your conclusions make up the bulk of the report.
e. A conclusion f. An appendix, if necessary
You have the option of working alone or in teams of up to three persons. If you collaborate, you will only submit one report. By the time of the interim report, the groups must be decided.
No amendments or exceptions to the three-person cap per project will be made after November 2.



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