TIMSS results
In antecipation of TIMSS results release 8 Dec, it may be informative to read our book chapter on what PISA and TIMSS measure and how: Read here.
Tests for comparing time series of unequal lengths
Journal of Statistical Computation and Simulation, Maio 2011.
Jorge Caiado, Nuno Crato and Daniel Peña.
This paper deals with hypothesis testing for independent time series with unequal length. It proposes a spectral test based on the distance between the periodogram ordinates and a parametric test based on the distance between the parameter estimates of fitted autoregressive moving average models. Both tests are compared with a likelihood ratio test based on the pooled spectra. In all cases, the null hypothesis is that the two series under consideration are generated by the same stochastic process. The performance of the three tests is investigated by a Monte Carlo simulation study.
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