Compute a mean score from several items in SPSS

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To compute a total scale score by summing the items follow these steps:

1. Open the SPSS data file.
2. Select Transform from the SPSS main toolbar.
3. Select Compute Variable.
4. Type the name of the new variable (the variable name you will assign to the scale score) in the target variable box in the upper left corner (e.g. Total Satisfaction).
5. In the Function group box click All or Statistical. Scroll down under Functions and Special Variables and click on SUM ( ).
6. Click on the up-arrow to move the function into the number expression box. It should read, SUM(?,?)
7. From the Type and Label box, select the variables that are included in the scale by clicking on each variable and then on the arrow to move it into the parentheses.
8. There should be a comma between each variable in the parentheses. Once you have confirmed this, click on OK and you are finished.

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