SPSS On-Line Training Workshop

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Carl Lee
Felix Famoye

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In this Tutorial:

Using Compute 

Recode (new var.)

Recode (same var.)

Sometimes the data that you have is not what is needed for your analysis.  For example, you may have the answers given to a number of questions, but what you need to know  whether these answers are correct or not.

You need to change this data to reflect the correct answers.  This is done through data transformation.

Click on the following movie clip to see how to transform variables::

camera.gif (1166 bytes) MOVIE:  Transformation of Variables camera.gif (1166 bytes)

In this on-line workshop, you will find many movie clips. Each movie clip will demonstrate some specific usage of SPSS.

Data Transformation: compute

You can use the compute command to transform data.  To do this, you must first name a target variable.  Then you must specify the conditions necessary to change the data.   For example, if you wanted to score a question, you would make your variable equal to 1, if the question was answered correctly.  However, this only gives you a transformation for the correct answer - it leaves all the incorrect answers as blanks.   Therefore, you must go back to the compute command to enter that your variable is equal to 0, if the question is answered incorrectly.   This transformation takes two steps using the compute command.

Data Transformation:  recode into a different variable

Recoding into a different variable is much faster, the transformation can be done all in one step. First, you must choose the variable which you are recoding and name the output variable which will hold your new value.  Next, you type in the old value and new values.   This can be done as many times as necessary to cover all the values of the variable.  However, you don't need to type all these values separately, you can use statements, such as "all other values" or you can define a range that you want to recode into a single value.

Data Transformation: recode into the same variable

Recoding into the same variable  is not really much different from recoding into different variables. Again you choose the variable which you are recoding.  Again, you would type in old values and new values.  When you press continue, your new values replace the old values.

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©This online SPSS Training Workshop is developed by Dr Carl Lee, Dr Felix Famoye and student assistants Barbara Shelden and Albert Brown , Department of Mathematics, Central Michigan  University. All rights reserved.