You can access from those machines a Math 251 IPS7e folder.

It is on \\Morganstore.wells.edu, a "Network drive," in

How to connect (on a Wells machine) to

Data Sets:

SPSS for Class:

**Website:**
http://bcs.whfreeman.com/ips7e.
Loads very slowly. Trouble making it work? The previous
edition's applets
http://bcs.whfreeman.com/ips6e
have many of the same datasets as the 7th. The more basic book http://bcs.whfreeman.com/bps5e
has "older" applets, work fine for all but the "statistical
calculator" and "two-asset portfolio" applets".

**Disk with book: ** Mostly mirrors the website.
Website may have some newer things. If it doesn't open
automatically, double click on IPS7e.htm.

**Applets **(website or
disk)

Under Student Categories or Student tools, choose "**Statistical
Applets**."
I know we'll use these:

**One-variable Statistical Calculator, **

**Mean & Median**,

**Normal Density,**

**Correlation/Regression,**

**Simple Random Sample:** For example, To pick
a sample from a "Population" list labeled 1 to 138, enter 138 in the
top
box, hit Reset. Put the size of the desired sample in the bottom
box.
Hit Sample. The sample numbers move to the right-hand
column.
To pick a different sample, hit Reset, then Sample.

This can be used to allocate units for an **experiment **like
this;
Suppose 12 units and 3 treatments. Each treatment should get 12/3
= 4 units. Put 12 in the population box, 4 in the sample box. Hit
Sample to choose the 4 numbers for the units to get treatment 1.
Hit Sample again (don't Reset) and it will choose the 4 from the
remaining
pool to get treatment 2. The remaining 4 will get treatment
3.
You can select and copy (Ctrl-c) the sample numbers into a Word
document.

**Probability** For a fair coin,
leave
probability at .5. It accumulates tosses until you hit Reset.

Also **Confidence interval**

**P-value of a test of significance
**

** Excel spreadsheets: **(also
in Math 251 Class
Material/Math251-IPS7e, when it becomes available)

What happens in normal distribution tails, beyond z = 3.49? NormalTails.htm

Regression, least squares

Slope of the regression line

Residuals

R-squared

Sample means:

Normal and Xbar, compared

ConfidenceInterval

Normal and t compared

t-procedures

two-sample t procedures

*Other links:
*

(do Sample: Animated sample; Distribution of means: n =5, then n = 25. Do Sample 5, 1000, 10000 after idea clear. )

**Datasets** and collections of
datasets (posting as I become aware of them, check them out)

**These are some sites I've visited this term, that have potentially great
data.
**

http://earthtrends.wri.org/miscell/sitemap.php?theme=0

Searchable databases give lots of info by country (CO2 emissions for example), downloadable to Excel

http://www.iea.org/stats/index.asp

http://www.iea.org/publications/free_new_Desc.asp?PUBS_ID=2143 may have been the source for CO2 emissions for some Moore books. An excel (.csv) download of data is here.

http://www40.statcan.gc.ca/ is just the tables, apparently.

**Gay marriage opinion polls: ** Most data here are just categorical,
but there is good time series data also. http://pewforum.org/uploadedFiles/Topics/Issues/Gay_Marriage_and_Homosexuality/same-sex-marriage-10-full-report.pdf

*Older good links, which I haven't checked for currency.*

DASL ( http://lib.stat.cmu.edu/DASL)
is an on-line library of datafiles and stories that illustrate the use of basic
statistical methods. These have some pre-analyzed “answers”
but there is probably more to find out from the data than what they present.
I looked through these—there are certainly interesting ones here.
The parent site, lib.stat.cmu.edu, has links to many interesting data sets (some
of which have enough information to be useful to you.) + has a GetData
link if you have trouble with the files in Datasets.

Two parts, Datafiles, and Stories. Each
Datafile has one *or more* Stories (context for the file).

If you list all Topics, you’ll get topics of the Stories.
Pick one and get a list of Stories relevant to that topic.
Click on a link for the desired Story and get the Story page.
There’s a link to the Datafile (and the Datafile page has a link
to the Story page).

Datafiles: The source information is given, n, and then a listing in text form
of the data. Variable values are (usually?) separated
by spaces. Copy and paste the data part only into
a text editor or Word, and save as a Text file. (Get rid of any leading or trailing
irrelevant lines.) Then SPSS should be able to import it; but check to make
sure it’s done the import process correctly!

http://lib.stat.cmu.edu/datasets
has datasets without so much background and machinery as the above.

http://www.CAUSEweb.org/resources/datasets has 232 potentially useful datasets, many with detailed suggestions for analysis; but again there are probably more things to find out than they present.

**World Bank: **/web.worldbank.org/data
Huge amounts of wonderful data for all the countries of the world (not all questions
have answers from all countries/years)

Some of the World Bank databases require paid subscriptions but many
don't. Try Data Resources box, lower right, or Quick Query. Mostly
you want to get to a Data Query engine where you can choose countries, variables
("series") and years ("time)You can download the data you've selected into excel,
massage it there, then import to SPSS. A search on "world bank statistics"
gives related searches that may not be redundant.

the **Population Reference Bureau** www.prb.org has similar data and more. The
DataFinder tab allows you to select; tables can be downloaded to Excel, you
can combine them there. To get an overview of the kinds of things, see
the PDF

http://www.prb.org/pdf09/09wpds_eng.pdf

The National Center
for Education Statistics (**NCES)** is a trove of data; Fast
Facts tab gives a list of some of what's there, summarized and shortened
data tables, with links to the rawer data; Tables & Figures
allows searches if you have an idea in mind; Data Tools has ways to build your
own tables, e.g. by State. Most tables seem to be downloadable either
to Excel or text (.csv--comma separated values--format)

Some other compendia of datasets, from googling "Statistical data sets", and
elsewhere

http://www.statsci.org/datasets.html

http://mathforum.org/workshops/sum96/data.collections/datalibrary/data.set6.html

http://www.umass.edu/statdata/statdata/

http://it.stlawu.edu/~rlock/maa51/data.html
“A
sampler of WWW resources for teaching statistics”—links to lots
of resources (some of which may not work anymore).

- - - - - - -

If you're interested in databases for a particular topic or issue, they
do exist--though often what you get is predigested results, and you want raw
data for the project. It may be that faculty or thesising seniors in your
field if interest can point you to relevant databases.

Sievers home | Math251-Fall11/Weblinks251.htm | 11am | 9/21/11 |