why is it important to use control as data for a baseline experiment which variable is used in the difference in difference method differences in different methods when is baseline data used for the difference test difference in difference definition difference in difference why is baseline data used by scientists as a control variable difference in difference experiment what variables are used for a difference method which random variable is used in the difference in difference method? what variables are used to control for a random experiment? what are control variables for the different in differences when is a baseline used in the difference in difference method what variables can be used to improve accuracy which of the following variables should be used in the difference in difference method? when do you use controls in the difference in differences method? why is data a control variable in a random experiment? why should you use control variables for a random experiment why use baseline as variable in a statistical analysis when a random experiment is conducted, baseline data is usually used as