The CANDECOMP/PARAFAC (CP) model decomposes a three-way array into a prespecified number of R factors and a residual array by minimizing the sum of squares of the latter. It is well known that an optimal solution for CP need not exist. We show that if an optimal CP solution does not exist, then any sequence …

The annual publication (since 1995) of the Corruption Perceptions Index (CPI) by Transparency International (TI) Secretariat in Berlin, gives the scores of the perceptions which selected observers have of the prevalence of corruption in their countries. They do not report about facts. Moreover, these …