Böckenhoff, AnnetteHartung, Joachim2004-12-062004-12-062000http://hdl.handle.net/2003/501310.17877/DE290R-15050Different estimation methods for covariance parameters in meta-analyses can result in conflicting p-values concerning the test of treatment effect. We propose a valid method to overcome this problem at least partially by introducing a new estimator for the standard deviation of the common treatment difference.enUniversitätsbibliothek Dortmund310report