I'm currently evaluating RobotC for Vex, trying to decide whether to use it in a robotics class that I teach at the High School level. One of the features that is very important to me is data logging capability. Is this something that RobotC for Vex can do? If so, can someone point me to an example or give an example of getting sensor data into a spreadsheet for analysis.

The controller in the VEX (and FRC) has a limited amount of RAM memory -- under 4K bytes or RAM. So it is not suitable for data logging.

ROBOTC for NXT has 15K of RAM dedicated for storing data logs. Enough for 1000s of data points. It also has a log of built-in functions specifically related to data logging. You might want to look at it.