Computations

You can specify automatic computed values of replies in the 'EDIT' – 'Questionnaire' tab. This feature is especially useful with quizzes and tests, where you are interested in the score (number of points), based on the values of individual answers. An example of use in a survey would be the calculation of a respondent’s age based on the year of birth.

You can add a computation in the 'EDIT' – 'Questionnaire' tab by navigating your mouse to the orange + icon, which will display the entire array of questions that are available. Computations are listed under the category 'Advanced features'. A new window will appear, where you can edit computations:

• First choose a variable from the dropdown menu (e.g. Q1);
• Then specify the desired operation, where you can choose between adding, subtracting, multiplying and dividing;
• Select another variable from the next dropdown menu. For example, you can set the computation Q1 + Q2;
• If you wish to include several operations and variable, repeat these steps.

The following advanced settings can also be used when editing computations:

• If you select the option 'Number' instead of the variable, this allows you to perform computations with constants (e.g. variable Q1 is multiplied by 10);
• The double-sided green arrow icon allows you to change the order of the variables, by clicking on the icon and dragging the variable to the desired position. The basket-shaped icon allows you to remove the selected variable from the computation;
• To the left and to the right of each variable, you will find blue icons in the shape of + and – signs, which allow you to edit brackets and ensure the correct order of arithmetic operations with complex computations;
• In the bottom left corner ('Name'), you can rename the computation. In the question text, you can also insert the value of the computation by entering #name_computations#;
• In the bottom left corner (next to the 'Name' field), you can determine the number of decimal places for computation (from 0 to 10).

With quizzes and test, you might want to set the value of individual answers before you enter computations (e.g. 1 for correct answer and 0 for incorrect answer). The value of each individual answer can be changed by clicking on the advanced editing icon when answering a question and entering the desired value in the 'Value' window.

A computation is the same as a computed value, which available in the 'DATA' – 'Computations' – 'Computed values' tab.