Indiana University
University Information Technology Services
What are archived documents?

Login is for authorized groups (e.g., UITS, OVPIT, and TCC) that need access to specialized Knowledge Base documents. Otherwise, simply use the Knowledge Base without logging in.


In SPSS, how do I set a variable to the system missing value?

In SPSS, $sysmis is the name of the system missing value. You can include this in a compute statement or in an if statement, as you would any other variable name. For example, if you want to generate the variable temp, which equals the system missing value, the syntax would look like this:

COMPUTE temp = $sysmis.

A more common scenario would be to use this variable in a conditional statement. For example, suppose you have two variables (v1 and v2), and you wish to recode all cases of v2 to be equal to the system missing value where v1 is also system missing. Rather than using the recode command, use an if statement like this:

IF sysmis(v1) v2=$sysmis.

You can use the variable $sysmis only as a value; you cannot use it in the actual conditional statement. If you are searching for cases where v1 is equal to the system missing value, you get this:

IF v1=$sysmis v2=$sysmis. ^^^^^^^^^^ wrong syntax

When using recode and if statements, set up a condition using the missing value by specifying sysmis(variable). Do not use the regular  =  (equals) sign.

If you have questions about using statistical and mathematical software at Indiana University, email UITS Research Analytics (formerly known as the Stat/Math Center). Research Analytics is located on the IU Bloomington campus at Woodburn Hall 200, and is open for consultation by appointment Monday-Friday 9am-5pm. For more, visit Research Analytics on the web, or call 812-855-4724 (IUB) or 317-278-4740 (IUPUI).

This is document afcg in domain all.
Last modified on September 26, 2012.

I need help with a computing problem

  • Fill out this form to submit your issue to the UITS Support Center.
  • Please note that you must be affiliated with Indiana University to receive support.
  • All fields are required.

Please provide your IU email address. If you currently have a problem receiving email at your IU account, enter an alternate email address.

I have a comment for the Knowledge Base

  • Fill out this form to submit your comment to the IU Knowledge Base.
  • If you are affiliated with Indiana University and need help with a computing problem, please use the I need help with a computing problem section above, or contact your campus Support Center.