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Research Article

Changes in the frequency and characteristics of children diagnosed with autistic disorder in two Norwegian cohorts: 1992 and 2009

Sidsel Romhus, Gyro Aas Herder, Elisabeth Grindheim, Synnve Schjølberg, Patricia Howlin

Scandinavian Journal of Child and Adolescent Psychiatry and Psychology , ISSUE 1, 3–12

Research Article

ANOTHER LOOK AT THE STATIONARITY OF INFLATION RATES IN OECD COUNTRIES: APPLICATION OF STRUCTURAL BREAK-GARCH-BASED UNIT ROOT TESTS

-tests, those tests with structural break reject more null hypotheses of unit roots of most inflation series than those without structural breaks. By applying variants of GARCH-based unit root tests, which include those with structural breaks and time trend regression specifications, we find that unit root tests without time trend give most rejections of the conventional unit roots. Thus, care should be taken while applying variants of the new unit root tests on weak trending time series as indicated

OlaOluwa S. Yaya

Statistics in Transition New Series , ISSUE 3, 477–493

Research Article

CPI INFLATION IN AFRICA: FRACTIONAL PERSISTENCE, MEAN REVERSION AND NONLINEARITY

’s polynomial in time. The results indicated nonlinear time trend in inflation for most of the countries. With the exception of Burkina Faso, which exhibited plausibility of naturally reverting to its mean level, the majority of the selected African countries would require stronger interventions to revert their observed inflationary levels to their mean levels.

O. S. Yaya, O. J. Akintande, A. E. Ogbonna, H. M. Adegoke

Statistics in Transition New Series , ISSUE 3, 119–132

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