STATGRAPHICS
Centurion Tutorial
STATGRAPHICS is an easy-to-learn, easy-to-use PC-based statistics software
package with an intuitive design that will make your everyday data analysis
easier than you ever imagined.
Upon entering StatGraphics for the first time, you
will be greeted with a StatWizard pane, which will
ask you
What task do you wish to perform?
To make things simple, toggle off the "Show the StatWizard at
Setup" option. [i.e. clear the box].
Then select OK.
Since you will be either entering data or using an existing data file,
select the appropriate option (do either one the first time through).
When you enter STATGRAPHICS, it displays an untitled data icon (middle of
screen), a StatAdvisor icon, a StatGallery
icon, an untitled Comments icon and a StatReporter
icon. When you are ready to start working, you can either enter new data or use
an existing file. The existing files can be either StatGraphics
files, spreadsheets (EXCEL) or data files from other software packages. For our
class we will restrict our data files to either StatGraphics
file (SF, SF3, or SF6 extensions) or EXCEL files (XLS extensions). [The StatGraphics software and manuals mention Statfolios, but to keep things simple at the outset, we
will ignore Statfolios from our discussion].
EXAMPLE 1. Opening an
existing StatGraphics data file, generating
descriptive statistics and printing out the generated statistics.
For this example we will be obtaining descriptive statistics from a data
file, CARDATA.SF,
which contains 154 observations for cars. In particular we will be getting
statistics about the random variable MPG, which represents the miles per gallon
of gasoline. Note that CARDATA.SF is a StatGraphics
file.
Helpful Hint: For a description of the buttons
on the system and analysis toolbars, simply place the cursor on the button and
a description of the button appears just below the cursor.
Helpful Hint: To see other options that
are available for an analysis, click the right mouse button on the pane of that
analysis and select Analysis Options...To maximize a pane, double-click on it;
to minimize it, double-click again.
How many observations are there for the variable mpg? What are the average and the standard deviation of the variable mpg?
To clear the output for analysis of new data
sets, select File ... Close ... Close StatFolio and
select “NO” to “Do you want to save the current StatFolio?”
EXAMPLE 2. Opening
an EXCEL file.
Rather than provide you with an EXCEL file, you will create an EXCEL
file that you will later open up as a data file in StatGraphics
for Windows.
mpg |
24 |
34 |
45 |
36 |
43 |
34 |
24 |
14 |
31 |
33 |
35 |
38 |
When the above information is read in as data to StatGraphics
for Windows, mpg will represent the name of the variable.
1. Close the file CAR.XLS in Excel first. In StatGraphics, select File...Open...Open Data Source and check “External Data File”.
2. Browse to the folder with the file CAR.XLS.
3. Now just select the file CAR.XLS.
The data is now ready for analysis!!
EXAMPLE 3. Creating a horizontal time series
graph, which can then be inserted into a WORD document.
There is a file called, TSDATA.SF. This StatGraphics file contains a variable bubbly, which
represent monthly champagne sales for a firm. We will create a horizontal time
series plot for bubbly and then import (insert) it into a WORD document.
How many observations are there for the variable bubbly? What are the average and the standard deviation of the variable bubbly?
Save the data file TSDATA.SF in a directory such as Desktop: select FILE…SAVE AS…SAVE DATA FILE AS … Name the file TSDATA.
Save the output: If you want to save all the output you have produced in StatGraphics, select FILE…SAVE AS…SAVE STATFOLIO AS and name the file BUBBLY.sgp. Make sure you save this StatFolio file BUBBLY.sgp in the same directory as the data file TSDATA. Now close StatGraphics. In My Computer or Windows Explorer, browse to the directory you saved both BUBBLY.sgp and TSDATA.SF and double click on the file BUBBLY.sgp. You have just re-opened all analysis you saved before!
Copy graphs to MS WORD: If you
want to insert the plot into a WORD document proceed as follows