You can add new variables to both the List of Document Variables and List of Code Variables::
- Select List of Document Variables or Code Variables from the Variables tab.
- Click on the New variable icon in the toolbar.
The following window will appear:
You can now insert a name for the variable and choose its type. The name can contain up to 63 characters including There are five different types of variables to be chosen from:
- Boolean (true/false)
When creating an integer or an decimal variable, you also have the option of defining whether it is a metric or a categorical variable. The variable for age, for example, can be handled in various ways: if you want to enter the age in years, you are dealing with a metric variable, for which you may want to establish a mean. If you have defined ages into categories (e.g. 1 = under 18, 2 = 18-30, 3 = 31-50, 4 = 51+), then you are dealing with a categorical variable, for which you would not want to find a mean value.
You can also select what value should be inserted automatically for those cases where there is a missing value. This is especially important if you are planning to do a statistical analysis later.
For better readability of variable values in MAXQDA, it can often be more convenient to use text variables instead of number variables. In a table column with the variable "familial status", the variable "married" will be more readable than a numeric code (like "2").
The number of variables is not limited in principle, that is, variables can be removed from the list or added to the list at any time. By clicking on the New variable button, you can mae new definitions. In the event that you want to define a large number of variables and, if necessary, the values for the cases already exist in a table-like structure or even as an SPSS record, you can save time by importing the file.
Rename and Delete Variables
Variables can be given a new name at any time. Double-click on the variable, and enter the new name.
Renaming a variable is possible at any time and does not affect the variable’s stored values.
To delete a variable, click on its row with the mouse to select it. Then click the Delete variable button in the toolbar. When you delete a variable, the whole column including all its values will be removed from the Data Editor.
Change Variable Type
MAXQDA allows for changes in variable types for existing variables:
- Document variables, which display how often a code exists (their source is acknowledged as “code”) can be transformed into a binary variable by clicking on the Convert to boolean variable symbol in the toolbar. After it is transformed, the variable will not show how often a code has been assigned in the document but if it has been assigned in this document or not.
- User defined variables Integer, Decimal, Date/Time and Boolean can be transformed into text variables by clicking the symbol in the toolbar.