I have reaction times for each of nine stimuli (the stimuli being the numbers 1 to 9), all 9 variables being arranged as columns, and with subjects across rows. I would like to regress those scores (Y) against their respective numbers (X), but have trouble understanding how to define this regression in my stats package (Statistica), whose help suggests that each of the two variables (X and Y) should be selected from the variables list. X in my case would just be the numbers 1 to 9, whereas Y would be each of the 9 columns (variables).
How should this simple regression be defined? Should it be a special type of regression given that the X variable is really categorical rather than continuous? Thanks!