University of Minnesota, Twin Cities
School of Statistics
Stat 5601
Rweb

# Stat 5601 (Geyer) Computing

We will be using computers in the course. The default statistical computing
package will be R and its web interface Rweb, which can be used in any web
browser. You are permitted to use any other computer statistics package
with which you are familiar and we can have installed in the computing lab
(so you can use it for tests),
but the instructor and teaching assistant may not be able to help you
with it.

R is a general purpose computing language designed especially for
statistics. You can do any computational problem in R,
but what it is really good at is statistics.

R is free software (both free as in "free beer" and free as in "free speech").
If you want to use it at home, you can download it from
CRAN
(the Comprehensive R Archive Network). It is available for Microsoft Windows
and all versions of UNIX (including Linux). A Macintosh port is there but
may be tricky to install. You do not have to download R if you don't want to.
R is installed in the computers in the lab (Room B53, Ford Hall), and R
can be used over the web on any computer that runs a web browser
(see the section on Rweb).

R is a free implementation of the S statistical computing environment,
originally developed at Bell Labs around 1980. S is now only available
as the S-Plus
proprietary (non-free, in fact fairly expensive, although
there are somewhat cheaper student editions) software package.
If you don't have either R or S-Plus, there is no point in getting S-Plus
for the needs of this course. If you already have S-Plus, you can use
it instead of R, although you may have to install (or have a system
administrator install) the `bootstrap` package we will use in
the second half of the course.

## Rweb

Because R is free software, it can be made to run over the web.

Many examples we will use in this course are inserted right in the
course web pages. For an example (not particularly related to nonparametrics),
click on the "Submit" button below, which runs Rweb to make a scatter plot,
do a linear regression, and draw the regression line for the data set in
the text file
`http://www.stat.umn.edu/geyer/somedata` entered in the "dataset URL"box.

After you've looked at the plot, use the "Back" button on your
browser to return here.

Note that this link is on the menu at the top of most of the course
web pages.