AM Statistical Software > Manual > Getting Started > Manipulating Data

Table Of Contents

Manual
- Getting Started
  - Starting the Program
  - Retrieving Data
  - Manipulating Data
  - Saving and Re-running Actions
    - Reviewing and accessing the code
    - Saving and re-running statistical models
- Sampling
- Procedures
  - Measurement Models
  - MML Models for Test Data
  - Other Available Procedures
- Graphics
- Tools
  - Estimation Methods
  - Optimization Techniques
  - Variance Estimation
- Post-hoc Procedures
- More user input instructions
  - The User Interface
    - Completed Run Queue
    - The Variable List
  - Input Instructions
  - Options
  - Output Precision
- Glossary of Terms and Symbols

Set Missing Values

When AM conducts an analysis, it omits cases with missing data. Use this feature to automatically set a particular value (or set of values) to missing. When you select this option from the Variable List Menu you will see a dialog box that looks like this:

Set Missing Values

The top of the dialog box presents some basic descriptive information about the variable's values. Using the radio buttons, indicate whether you want to set all values equal to, greater than, less than, or not equal to a value. Specify the value in the edit box below. Note that if you make everything "greater than" 8 missing, 8 will not be converted to a missing value--only those values greater than (not equal to) eight. Same for less than.

Note that this operation modifies the original variable.