How To Compute Variables In Spss
Sometimes you may need to calculate a new variable based on existing information (from other variables) in your data. For example, you might want:
- Convert the units of a variable from feet to meters
- Use the subject’s height and weight to calculate their BMI
- Calculate subscale scores from items in a survey
- Apply conditional calculation so that the new variable is only calculated for cases where certain conditions are met
In this tutorial, we will discuss how to calculate variables in SPSS using numeric expressions, built-in functions, and conditional logic. Change > Calculate variable.Read more: SLAW.me The Compute Variable window will open where you will specify how your new variable will be calculated.
One Target variable: The name of the new variable will be created during the calculation. Just enter a name for the new variable in the text field. Once a variable is entered here, you can click “Type & Label” to specify the variable type and set a label for it. The default type for new variables is numeric. The left column lists all the variables in your data set. You can use this menu to add variables to a calculation: double-click a variable to add it to the Numeric expression field, or select the variable(s) to be used in your calculation and click the arrow to move them to the Numeric expression text field (C).Read more: How to get to the city of starsC Number Manifestations: Specify how to calculate the new variable by writing a numeric expression. This expression must include one or more variables from your data set and can use arithmetic or functions. When writing an expression in the Calculate Variables dialog window:
- SPSS is not case sensitive for variable names.
- When specifying a formula for a new variable, you must optionally include or not include a space after the comma between arguments in a function.
- Do not put a period at the end of the expression you enter in the Numeric expression box.
D The center of the window includes a set of arithmetic operators, Boolean operators, and numeric characters, which you can use to specify how your new variable should be calculated. There are many types of calculations that you can specify by selecting a variable (or variables) from the left column, moving them to the center text field, and using the blue buttons to specify the values ( e.g. “1”) and operations (e.g. , +, *, /).E If: The If options allow you to specify the conditions to which your calculation should be applied. Functional group: You can also use the built-in functions in Functional group list on the right side of the window. The function group contains many useful, common functions that can be used to compute values for new variables (e.g. mean, logarithm). To find a specific function, simply click on one of the function groups in Functional group list. You will now see a list of functions that belong to that function group in Functions and special variables area. If you click on a specific function, a description of that function will appear in the text field on the left.
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