When a dialog box contains a field where you can enter a variable from your worksheet, you can choose the variable from the variables list on the left side of the dialog. Under certain circumstances, the variables list may be empty, even when there are variables in your worksheet.
The following conditions can cause the variables from your worksheet to not appear in the variables list in the dialog box.
Your insertion point is not in a field that accepts variables
If your insertion point is not in any field, or is in a field that does not accept variables, the variables are not displayed in the variables list.
Your insertion point is in a field that does not accept the data type of the variables column
If the variable column is not the correct data type for the field, the variable is not displayed in the variables list. For example, if your insertion point is in a field that accepts only numeric variables, but the variable column is of the text data type, the variable is not displayed.
Check the data type of the column. If the column header includes "-T" (for example, "C1-T"), then the data type is text. If the column header does not include "-T", then the data type is either numerical or date/time.
To change the data type of a column from text to numeric, choose Data > Change Data Type.
The variable column is hidden in the worksheet
If a column is hidden in the worksheet, the column might not be displayed in the variables list.
To determine whether any columns are hidden, with the worksheet active, choose Editor > Column Properties > Hide/Unhide Columns.
To display hidden variables columns in dialog boxes, with the worksheet active, choose Editor > Column Properties and select the Use Hidden Columns in Dialog Boxes checkbox.
To set the default for whether Minitab displays all of the columns in dialog boxes or only unhidden columns, choose Tools > Options > Dialog Box and select the setting.