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Number of cases
When doing regression, the cases-to-Independent Variables (IVs) ratio should ideally be 20:1; that is 20 cases for every IV in the model. The lowest your ratio should be is 5:1...
Here's our sample data file again, in comma-delimited format. Copy it to a text file, save it and read it into an S-Plus object called data to follow along with the...
Basic Commands
Once you connect to tombstone you will need these basic commands to get started:
pico Pico is a simple text editor. You can use pico for editing Stata do files.
ls Show a list of...
If you have questions or comments about this site, please email ude.notecnirp|atad#ude.notecnirp|atad.
DBMS/Copy can be used to convert spreadsheets from Excel and similar programs to many other formats. Often, it is easier to save your spreadsheet as a comma separated values (csv) or tab-delimited...
If your data file is in SPSS format (have an extension .sav or .por), and want to convert it into Stata format, you can either use (1) SPSS or (2) DBMS\Copy to do the conversion. To use SPSS, you...
DBMS/Copy can be found on tombstone. Users first need to activate tombstone account.
The DBMS/Copy command-line interface uses what it calls "pseudo extensions" to indicate exactly what type of...
DBMS/Copy can be used for converting data from one statistics package format to another. Converting SAS data files into Stata can be problematic, so check out SAS data conversion issues.
1. start...
Welcome to DSS Help! Here you will find information regarding to working with data and statistics. We are slowly adding files, and welcome your input. If you want to contribute, email...
Why use dummies?
Regression analysis is used with numerical variables. Results only have a valid interpretation if it makes sense to assume that having a value of 2 on some variable is does indeed...
Planning Your Analysis
Choice of analysis should be based on the question you want answered. So when planning your analysis, start at the end and work backwards.
* What conclusion are you trying to...
Definitions of social science, statistical, and data terminologies are explained in the pages at:
ICPSR
and
Social Science Research and Instructional Council of CSU- Bakersfield
Splus has a powerful graphics environment. Before you can begin to plot things in Splus, you need to open a graphics device. Opening a graphics device is as simple as typing the name of the device...
Princeton members who have computing intensive jobs may request an account from TIGRESS .
The assumption of homoscedasticity is that the residuals are approximately equal for all predicted DV scores. Another way of thinking of this is that the variability in scores for your IVs is the...
If you are allowed to edit pages in this Site, simply click on edit button at the bottom of the page. This will open an editor with a toolbar pallette with options.
To create a link to a new page,...
Cygwin is a free X Window program for Windows. It allows you to run programs on a remote server locally with graphical user interfaces.
1. Download the latest version of the Cygwin installer
2....
If you want to install user made programs and use them on tombstone, you can make a directory for the ado files in your profile and have Stata direct to the directory. Suppose you want to install...
Regression analysis is used when you want to predict a continuous dependent variable from a number of independent variables. If the dependent variable is dichotomous, then logistic regression...
An Introduction to S-Plus
* Overview
* S-Plus and Objects
* Using S-Plus
* Getting Help
Overview
S-Plus is an interactive programming environment for data analysis and graphics. It is based on the...
Please change this page according to your policy (configure first using Site Manager) and remove this note.
Who can join?
You can write here who can become a member of this site.
Join!
So you...
Much of how SPSS reads a file in a language is dependent on which version of Windows you are using. Windows 2000 and XP have strong support for displaying characters that are different from the...
Linearity means that there is a straight line relationship between the IVs and the DV. This assumption is important because regression analysis only tests for a linear relationship between the IVs...
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If specific variables have a lot of missing values, you may decide not to include those variables in your analyses. If only a few cases have any missing values, then you might want to delete those...
Multicollinearity is a condition in which the IVs are very highly correlated (.90 or greater) and singularity is when the IVs are perfectly correlated and one IV is a combination of one or more of...
Standard multiple regression is the same idea as simple linear regression, except now you have several independent variables predicting the dependent variable. To continue with the previous...
To check that your data is normally distributed, you can construct histograms and "look" at the data to see its distribution. Often the histogram will include a line that depicts what the shape...
Octave is a free ware similar to Matlab, available from GNU. You may download it from GNU's page.
PSPP is a free statistical package GNU has made as an equivalent to SPSS. You may download download it from GNU's site. We have not tested it, but you may try and tell us how it works for you.
Data comes in many formats, and Splus has a number of different commands for reading in different formats. I'll talk about two commands here: sas.get and read.table.
Reading in SAS formated data
If...
ICPSR is pleased to announce the beta launch of the ICPSR Data User Help Center!
Links to the Data User Help Center can be found under the Help tab and the Data tab on the ICPSR Web site...
Most data files are arranged with lines of information for each observation (a person, a state, or a company) and columns of information representing different variables. Each variable of a data...
Suppose you need to move your SAS data files from from UNIX to your PC. SAS data files can be easily moved from one operating system to another as long as they are written in a transportable...
Converting SAS system and transport files to another format such as Stata or SPSS can be tricky. How you convert it depends on how the file was created and on what platform.
Additionally, a SAS...
SAS 9.12 is available on the new high-performance Unix server tombstone. Users of tombstone need to register before using this service; to find out more and register an account, see OIT's...
The SAS System is an integrated statistical package that allows you to do statistical analyses, such as descriptive statistics, multivariate techniques and time series, using a consistent set of...
Stata can read SAS transport files with the command
fdause filename.fileextention
So if you have a SAS set up file and need to run a SAS program to convert an ASCII data, you may create a transport...
The current realeases of SAS running on Arizona and Windows are Year 2000 compliant. However, it is important that you are aware of how SAS processes dates, particularly if your dates use 2-digit...
SAS data files contain both data and information about the data, such as variable and value labels. SAS data files are stored in a special format that is written to and read by the SAS System. It...
From the Start menu, start SSH Secure Shell client. From the SSH Secure Shell window, select Quick Connect. In the Connect to Remote Host window, enter as in the following.
Host Name:...
For SPSS 15:
1. change the computer's language settings (on Windows).
2. start SPSS, and open the dataset.
For SPSS 16:
1. change the computer's language settings (on Windows).
2. start SPSS, but...
If you have a dataset with labels written in foreign languages like Chinese, Korean, or Hebrew, you may be able to show the labels on a Windows' machine which you have an administrator privilege....
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Invoking S-plus
At the Unix prompt, type Splus. To get out you type q().
Note that UNIX commands are case-sensitive. The command Splus will invoke the software, but the command sPlus or SPLUS will...
The Basics
S-Plus has a very consistent language syntax and many of the basic commands mirror basic unix commands:
Basic Splus Commands
ls() list files in directory
rm(object) remove object from...
Note: OIT no longer updates SPSS for Unix. It therefore lacks some capabilities of the current version of SPSS for Windows.
SPSS, a major statistical package geared toward social science data...
When you have very time consuming job in stata, you can submit the task in tombstone, which will run in the background. Unlike in the Window's version, you do not need to wait for the commands to...
There are several text editors available on UNIX. Among these are vi, emacs, and pico. Which one you use is a matter of personal preference. Try each and see what suits your needs best. Pico is...
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Accounts on Princeton University's central 64-bit UNIX server, called "tombstone," are available to all students, faculty, and staff, but require registration. Tombstone is the home of all of...
Working with Files
Task
Command
Example
List
ls
ls -l
Copy
cp fromfile tofile
cp prog1.txt prog2.txt
Delete
rm filename
rm data.csv
Move
mv frompath/fromfile tofile
mv...
Your UNIX account has a certain amount of space in which you can store files. The following command will show you how much space you are given ("quota") and how much you are currently using...
To unzip files that have an extension .gzip, you can
- use WinZip. DSS lab computers have WinZip installed.
- install 7 zip on your computer. The program is free. Note that you can not install...
Where SAS transport files are used to transfer SAS files from one operating system to another (e.g., MVS, UNIX), you can use DBMS/COPY to convert SAS data files for use in other statistical...
Using Stata on tombstone has several advantages.
1. You do not need to buy the program and install it on your computer, but still do analyses using Stata if your computer has an internet...
According to Wikipedia, the world largest wiki site:
A Wiki ([ˈwiː.kiː] <wee-kee> or [ˈwɪ.kiː] <wick-ey>) is a type of website that allows users to add, remove, or otherwise edit...
DBMS\Copy for Windows
DBMS\Copy for Windows is available at DSS lab computers. It is no longer available at OIT cluster computers.
DBMS\Copy for Unix
DBMS\Copy for Unix is available at tombstone....
Window's version, 15, is available at McCosh 59 cluster and DSS computer lab.
Unix version, 6.13, is available through tombstone. You need to have tomstone account activated and access tombstone...
Window's version
At Princeton University, you have access to Stata at
OIT cluster computers
Windows - you can find StataSE9 and StataSE10 in the "Special Applications" folder on the...
If this is your first site
Then there are some things you need to know:
You can configure all security and other settings online, using the Site Manager. When you invite other people to help build...
To set language on a computer, you need to be able to log in to the computer with an administrator privilege. Depending on the language, you may need the Windows' installation CD. Because you are...
If you wish to run X Window programs on a Macintosh computer, you may follow the directions on Apple's Developer Connection page.
Using an X Window program, you can run Stata, SPSS, or SAS with graphical user interfaces. The X Window interfaces look and function similar to Windows versions of the programs, and have full...
