This Springer open-access book is one of the first to be published, or even the first, discussing the results of PISA 2018. It analyses how ten different countries have evolved and what makes countries change.
Özdemir, Caner Ph.D., Department of Sociology Supervisor: Prof. Dr. Ayşe Gündüz Hoşgör July 2015, 236 pages ABSTRACT: This dissertation aims at finding the relationship between
AbstractWe propose and study a new frequency-domain procedure for characterizing and comparing large sets of long time series. Instead of using all the information available
Glad to Present at ResearchED National Conference 2021, Saturday Sept 4 / Session 1 – 10:05 – 10:45. “After the longest year, we are delighted
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2021, Crato, N. (Ed.) Improving a Country’s Education: PISA Results in 10 Countries PISA 2018 was the largest large-scale international assessment to date. Its results
PISA 2018 was the largest large-scale international assessment to date. Its results confirm the improvements of some countries, the challenges other countries face, and the decline observed in a few others.
We propose and study a new frequency-domain procedure for characterizing and comparing large sets of long time series. Instead of using all the information available from data, which would be computationally very expensive, we propose some regulariza-tion rules in order to select and summarize the most relevant information for clustering purposes. Essentially, we suggest to use a fragmented periodogram computed around the driving cyclical components of interest and to compare the various estimates. This procedure is computationally simple, but able to condense relevant information of the time series. A simulation exercise shows that the smoothed fragmented periodogram works in general better than the non-smoothed one and not worse than the complete periodogram for medium to large sample sizes. We illustrate this procedure in a study of the evolution of several stock markets indices. We further show the effect of recent financial crises over these indices behaviour.
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