How smart are nations? about corrections and correlations of international data

The homogeneity of the results of international cognitive assessments which Rindermann claims in his paper will be questioned on two levels: First, Rindermann corrects national data sets by a certain amount if specific test participation rates are available, without testing whether the samples are representative. Second, we will demonstrate with an example that the correlations reported can by no means be considered as evidence for the homogeneity of different cognitive tests and other indicators.