When you take a look at the data set, you will see several new variables that have been calculated from our syntax. 

The first is "pred" for prediction, a score based on your ability to read (sheet 1) and identify colors (sheet 2).  The second is "inter" for interference, a score reflecting the amount that your ability to read the word interferes with your identification of the word's color (sheet 3).  The third is "lefth" for left-handedness, a score that reflects how frequently you prefer using your left hand for the tasks on the handedness questionnaire.  The fourth is "righth" for right-handedness, reflecting how frequently you prefer using your right hand for those tasks.  The fifth is "handed," a score that combines your right and left hand preferences and reflects your overall hand preference.

We then transformed your computer times to scores on the 3 Traditional Stroop Sheets (pt1score, pt3score, pt4score).  We only used parts 1, 3, and 4 because they were the ones that corresponded to the 3 sheets on the traditional Stroop Task.  Prediction and interference scores (comppred, compintr) were then calculated using these 3 computer variables.