Minitab Statistics: Minitab analysis & regression

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Minitab Analysis

Minitab Instructions 1:
Entering and saving data
Creating tables of frequencies, percents, and proportions
Creating a histogram

By Dr. Jane Scott

To enter a dataset into minitab as a column:
1. On the worksheet page, click on the grey box under the column number to enter the name of the dataset. Enter the data in the rows underneath. Use “Enter” or the down arrow to move your cursor down the rows.

To save your project:
1. Under the “File” menu, choose “Save Project As.” Enter the location of where you want to save your file, enter a file name for your project, save as type “Minitab Project (*.MPJ)” and click “Save.”

To construct a table with frequencies, cumulative frequencies, percents, and cumulative percents:
1. Under the “Stat” menu, choose “Tables” and then choose “Tally Individual Variables.” Make sure your cursor is in the Variables window. Select the variable of interest from the list of variables on the left. Click the “Select” box. Your variable should appear in the Variables window. Under “Display,” choose Counts (frequencies), Percents, Cumulative counts (cumulative frequencies), and Cumulative percents. Click OK. Your results will appear in the Session window.

To paste a table from the session window into the worksheet:
1. Use your mouse to highlight the table from the session window. Be sure to select the column labels. Copy the highlighted table using “Copy” from the “Edit” menu or “Ctrl+C.”
2. In the worksheet, put your cursor in the grey box of the first column where you want to paste your table. I recommend leaving several blank rows so that you know that this is a separate table. Choose “Paste Cells” from the “Edit” menu or “Ctrl+V.” Minitab will ask you how you want to interpret embedded spaces. Choose “Use spaces as delimiters.” Click OK. Your table will appear in the worksheet. The column labels should appear in the grey boxes at the tops of each column.

To compute proportion from percent:
1. Choose a blank column where you want proportions to appear. Click in the grey box at the top of the column and type in the column heading “Prop.”
2. Under the “Calc” menu, choose “Calculator.” In the pop-up window, put your cursor in the window next to “Store result in variable.” From the variable list, click on “Prop.” Click the “Select” box underneath the list of variables. The variable name (Prop) should appear in the window next to “Store result in variable.”
3. Put your cursor in the big window underneath “Expression,” highlighting whatever appears in the window. Click on “Percent.” Click the “Select” box underneath the list of variables. You want to divide the percents by 100 to compute proportions so choose the “ / ” sign from the calculator keyboard. Then type in 100.
4. Click “OK” to close the pop-up window. The proportions will appear in your worksheet in the column that you designated.

To compute cumulative proportion from cumulative percent:
1. Choose a blank column where you want cumulative proportions to appear. Click in the grey box at the top of the column and type in the column heading “CumProp.”
2. Under the “Calc” menu, choose “Calculator.” In the pop-up window, put your cursor in the window next to “Store result in variable.” From the variable list, click on “CumProp.” Click the “Select” box underneath the list of variables. The variable name (CumProp) should appear in the window next to “Store result in variable.”
3. Put your cursor in the big window underneath “Expression,” highlighting whatever appears in the window. Click on “CumPct.” Click the “Select” box underneath the list of variables. You want to divide the cumulative percents by 100 to compute cumulative proportions so choose the “ / ” sign from the calculator keyboard. Then type in 100.
4. Click “OK” to close the pop-up window. The cumulative proportions will appear in your worksheet in the column that you designated.

To create a histogram:
1. Under the “Graph” menu, choose “Histogram” and then choose “Simple” and click OK. Select the variable of interest from the list of variables on the left. The variable that you choose should be the full data set (not a column from a frequency table). Click the “Select” box. Your variable should appear in the “Graph Variables” window. Click OK. Your histogram will appear in a separate window. (If you get any kind of strange message, keep clicking OK and your histogram will eventually appear.)

Minitab Instructions 2:
Computing Basic Statistics (Mean, standard deviation)
Computing z-scores

To compute basic descriptive statistics using the “Basic Statistics” command:
(Results will be displayed in the “Session” window.)
1. From the “Stat” menu, choose “Basic Statistics” and then choose “Display Descriptive Statistics.”
2. In the pop-up window, put your cursor in the “Variables” window. From the list of variables, click on the variable for which you wish to compute basic descriptive statistics. Click on the “Select” box underneath the variable list. The variable should appear in the “Variables” window.
3. Click on the “Statistics” box. A window called “Descriptive Statistics-Statistics” will appear. Click in the boxes to the left of the statistics that you wish to compute so that a check-mark appears. Click on check-marks to make them go away if you do not want certain statistics. Click “OK” to close the window.
4. Click “OK” in the “Display Descriptive Statistics” window.
5. Descriptive Statistics for your variable should appear in the session window.

To compute z-scores from raw scores:
1. Click on the grey box in a new column and type in the column label “z-scores.”
2. From the “Calc” menu, choose “Standardize.” Make sure your cursor is in the “Input columns” window. Choose the variable that you wish to transform into z-scores from the list of variables. Click the “Select” box underneath the list of variables. Your variable should appear in the “Input columns” window.
3. Place your cursor in the “store results in” window. Choose “z-scores” from the list of variables. Click the “Select” box underneath the list of variables. “z-scores” should appear in the “Store results in” window.
4. Choose “Subtract mean and divide by std. dev.” Click OK. Standardized scores will appear in your “z-scores” column next to the corresponding raw scores.