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-  Ceiling Effect - Holte's 1R example
 -  Regression Effects - if chance plays a role, then always run the
same problems
 -  Order Effects - counter balancing or a few orders
 -  Sampling Bias - how data collected is very important - the
independent variable can change the the location of the distribution
but not its shape
 
 
Patricia Riddle 
Fri May 15 13:00:36 NZST 1998