# MINITAB

In order to use the DEC Alpha, you must first set up an account. Contact ITS Computer Consulting Center in Business 27 (Phone 319-273-5555) for an application.

To sign on, press until you get a list of computers. Choose 6 for the DEC Alpha (Acad). Then enter your username and password at the prompts.

If you are new to the DEC Alpha (Acad), you should read the document "Introduction to the DEC Alpha". It can be obtained from the Consulting Center.

## Support Articles

You may wish to attach a more descriptive name to a column. A name in Minitab may be up to 8 characters long. The NAME command in Minitab assigns names to columns. The syntax is this:NAME column= '...

August 6, 2010

The INSERT command in MINITAB allows you to insert rows into a worksheet. The syntax of the INSERT command is the following:INSERT ['filename'] [between row row] columnsTo add rows to the end of the...

August 6, 2010

Analysis of Covariance refers to having both continuous and categorical independent variables in a model. This can be accomplished in MINITAB using the regression command.Let's try to do an...

August 6, 2010

When there are more than two groups, an analysis of variance is used rather than a two-group t-test. The null hypothesis of analysis of variance would be that there is no difference in the mean of...

August 6, 2010

Suppose that the 20 people in our study are a sample of a larger population. We might desire to infer things about the larger population from the sample. We might wish to estimate what the mean of...

August 6, 2010

Variables that begin with the letter "K" in MINITAB are considered constant rather than column variables. Constants are used when you want to store only one number rather than a series of numbers....

August 6, 2010

The Pearson product moment correlation coefficient is often referred to simply as the correlation. It is a measure of the association of two variables and usually designated by the letter r. A...

August 6, 2010

You can calculate new columns based on old ones in Minitab. The LET command in Minitab is used to calculate a column. The syntax is this:MTB> LET column= arithmetic expressionThe following...

August 6, 2010

The ERASE command in MINITAB can delete columns and constants in a worksheet. The syntax is:ERASE columnTo delete column 1 of the worksheet, type:MTB> ERASE C1

August 6, 2010

The DELETE command in MINITAB deletes rows in a worksheet. The syntax is:DELETE row cn-cn To delete row 5 of the worksheet, type:MTB> DELETE 5 c1-c5

August 6, 2010

Minitab is an interactive package. To enter it, type:$ MINITAB You should see the following:

August 6, 2010

Minitab operates on columns of data rather like a spreadsheet. These columns are labeled C1,C2,C3,C4,C5, etc. You can refer to a range of columns by using a dash between column numbers. For example...

August 6, 2010

When you have a great deal of data, you may prefer to enter data directly into a file, then read the file into MINITAB.To enter the file, from the DCL dollar sign prompt use the EDIT command, like...

August 6, 2010

When you have categorical data, you frequently desire to know how many of each group there are. A frequency table will provide this information. The TALLY command in MINITAB produces frequency...

August 6, 2010

To view the data, use the Minitab PRINT command. For example, to print columns 1 to 5 of the data, issue this command:MTB> PRINT C1-C5The data would then appear like this:ROW C1 C2 C3 C4...

August 6, 2010

A histogram of the data can be produced by using the DOTPLOT command in MINITAB. Type:DOTPLOT columnFor example, we might want to plot our improvement in test scores. Type:MTB> DOTPLOT 'IMPROV'

August 6, 2010

One column can be plotted against another column in a two dimensional scatterplot using the PLOT command. Type:PLOT column columnTo plot TEST4 on the Y axis and TEST1 on the X axis, type:MTB>...

August 6, 2010

The DESCRIBE command prints descriptive statistics for each column. The statistics produced by this command are:N -- the number of items in the column N* -- the number of missing values in the...

August 6, 2010

If your data is separated by spaces in the file, the syntax of the command is the following.MTB> READ 'filespec' columnsThe following command reads five columns of data from the file GRADES.DAT...

August 6, 2010

The SET command in MINITAB allows you to enter one column at a time. The syntax is this:SET columnWith the SET command, you can enter more than one number on a line. All the numbers will be placed...

August 6, 2010

Simple linear regression tells us whether using a linear model is a better fit of the data than just using the mean. A regression model Y=B0 + B1*X1 would test for whether the slope B1 is...

August 6, 2010

To retrieve a worksheet previously saved with the SAVE command, use the RETRIEVE command. The syntax is this:RETRIEVE 'filename'To retrieve the worksheet 'GRADES', enter:MTB> RETRIEVE 'GRADES'

August 6, 2010

The SAVE command in Minitab saves the worksheet, along with names. MINITAB worksheets saved with the SAVE command can only be accessed through MINITAB, so do not attempt to look at these files at...

August 6, 2010

Since MINITAB is an interactive package, results are shown on the screen. You may wish to make a hard copy of your results, such as to hand in if you are in a class. The OUTFILE and NOOUTFILE...

August 6, 2010

Some useful DCL command stringsDCL stands for Digital Command language. The DCL prompt is the dollar sign. From it you can enter DCL command strings, and run SAS. DCL command strings are composed...

August 6, 2010

The MINITAB TTEST command is used to determine if the true mean of a column is different from a hypothesized mean. In the case of our column which contains the improvement from TEST 1 to TEST 4, we...

August 6, 2010

A two-dimensional table can cross one categorical variable by another categorical variable. This may be useful, for example, if you which to know the breakdown of class for each sex. The following...

August 6, 2010

A two group T test asks whether the mean of a column for one group is significantly different than the mean of that column for another group.Suppose we wanted to know if there was a difference...

August 6, 2010

Categorical data refers to data which is coded to represent some group. The numbers used to code the data are usually arbitrary and thus statistics that use the values of these numbers in...

August 6, 2010

An equivalent to using analysis of variance is to use what are called dummy variables in regression. Dummy variables are indicator variables. They are normally coded 0 or 1. In order to use our '...

August 6, 2010