Experimental Study Design

Experimental Study Design

1. Control Treatment

   • includes everyting the treatment levels have except the treatment itself
     • one level in each factor

2. Blocking

   • stratified sampling: sampling units selected and randomly allocated

3. Blinded

   • sampling unit doesn't know which group they're in
   • double blind: researcher and unit don't know; no accidental bias

4. Placebo

   • substance with no effect on response variable; no active ingredient

5. Sham treatment

   • to account for effect of delivery of a treatment that is not of interest
   • ex. do a "surgery" without impacting the critical issue