[en] We develop a quantification method of effectiveness of a set of integral data for verification of nuclear data. This study uses the singular value decomposition, the orthogonal projection and the concept of active sub-space. By using the proposed method, we can quantify the independency of a set of integral data and the possibility of verification of individual nuclear data by a set of integral data. In this study, we consider fictitious homogeneous spherical critical assemblies: bare assemblies and water-reflected assemblies, and the proposed method is tested against these assemblies. Through numerical calculations it is found that the proposed method is promising. (author)