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As you can see here (http://wiki.ros.org/navigation/Tutorials/RobotSetup/Odom) odometry information is usually published as a transformation between the odom and the base_link frame. So. when you set odom as fixed-frame, you should see the base_link frame moving, if your odometry info (dead-reckoning) changes.

Generally, I would suggest setting the fixed frame either to map (if your localization works) or to base_link (if you want to take the perspective of the robot, or your localization is not running)

See also http://wiki.ros.org/amcl#Transforms for an explanation.