Dean Radin on Coast to Coast

”Radin is aware of the file-drawer effect, in which only positive results tend to get reported and negative ones are left in the filing cabinet. This obviously can greatly bias any analysis of combined results and Radin cannot ignore this as blithely as he ignores other possible, non-paranormal explanations of the data. Even the most fervent parapsychologists recognize this problem. Meta-analysis incorporates a procedure for taking the file-drawer effect into account. Radin says it shows that more than 3,300 unpublished, unsuccessful reports would be needed for each published report in order to “nullify” the statistical significance of psi. In his review of Radin’s book for the journal Nature, statistics professor I.J. Good disputes this calculation, calling it “a gross overestimate.” He estimates that the number of unpublished, unsuccessful reports needed to account for the results by the file drawer effect should be reduced to fifteen or less. How could two meta-analyses result in such a wide discrepancy? Somebody is doing something wrong, and in this case it is clearly Radin. He has not performed the file-drawer analysis correctly.[2]