Stat 133, Spring 2011
Homework 3: Graphics and Databases
Due Friday, Apr. 1 at 11:59PM
- At the web site http://www.fao.org/es/esc/prices/PricesServlet.jsp?lang=en
is an applet that allows you to download data for prices of various commodities
over ranges in time. Note that you can make multiple choices of commodities and dates by pressing
the control key while clicking on the choices, or by clicking on a first choice and shift-clicking
on a final choice. You can
copy the link to the CSV file that appears after you click 'Submit Query' to download directly
into R, or download the CSV file to your computer in the usual way.
Choose between four and eight commodities of interest, and download the
monthly data for as many years as are available. Convert the dates to
one of R's date types, and plot each commodity's price over time in such a way
that it's easy to compare the changes in the different commodity's prices over time.
-
At the web site http://www.dof.ca.gov/HTML/FS_DATA/STAT-ABS/Toc_xls.htm
are links to several Excel spreadsheets containing statistical information
about California.
Choose a spreadsheet from that web page that interests you, download it,
and read it into R using one of the methods presented in class. You should
choose a spreadsheet that has at least one variable for every county in
California. Choose a suitable gradient, and divide the variable into a
reasonable number of groups, and create a map of California with the colors
of the gradient representing the value of the variable for each county.
-
I have placed a copy of the SQLite albums database that was used in lecture
at http://www.stat.berkeley.edu/classes/s133/albums.db. Use the database to answer the following questions:
- List the names of the ten songs which appear the most times in the collection, along with the number of times they appear.
- List the names of the ten artists who have the most albums in the collection,
along with the number of albums.
- List the names of the ten artists who have the most tracks in the collection,
along with the number of tracks.
- List the names of the ten artists who have the most total time (length) for
all their tracks in the collection, along with the total time.
-
The next part of the assignment uses a baseball database which was
downloaded from http://www.baseball-databank.org/.
You will need to access the MySQL server running on springer.berkeley.edu
using the username and password given in class, and, if you're not using an SCF
machine, you'll have to set up an SSH tunnel.
There are 25 data tables in the database, many of which you won't need
to use. Answer the following three questions using at least one data summary
and/or graph to support your answer.
- Which college has produced the baseball players with the highest batting average?
Batting average can be calculated by taking the number of hits (column H
in the Batting table) and dividing by the number of at-bats
(column AB in the Batting table). You may want to eliminate
players who have had fewer than, say, 50 at-bats from the calculations.
-
Do players who hit more home runs receive higher salaries than players who hit
fewer home runs?
-
Do players who have nick names (nameNick in the Master table)
tend to receive higher salaries than players that don't have nick names?
Can you think of a reason why this may be true?
Notice that for the last two questions it's important to take time into account.
In other words, you'll have to break down your analysis to handle each year
separately.
Your submission should be contained in a single pdf file.
Email this file to me
(s133@stat.berkeley.edu),
by 11:59PM (plus or minus a minute)
on the due date. Make certain to save a copy of your email submission.
File translated from
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version 3.67.
On 11 Mar 2011, 15:54.