Uncovering null effects in null fields: the case of homeopathy

Erdfelder, Edgar ¹     ; Nagel, Juliane ²     ; Heck, Daniel W ³     ; Petras, Nils <sup>1    

1</sup>  Department of Psychology, School of Social Sciences, University of Mannheim, Mannheim, Germany 
²  Department of Clinical Psychology, Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany; Department of Addiction Behavior and Addiction Medicine, Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany; Department of Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany 
³  Department of Psychology, University of Marburg, Marburg, Germany