NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

NBER Working Papers by Ataman Ozyildirim

Contact and additional information for this authorAll NBER papers and publicationsNBER Working Papers only

Working Papers

January 2002Time Series Decomposition and Measurement of Business Cycles, Trends and Growth Cycles
with Victor Zarnowitz: w8736
A study of business cycles defined as sequences of expansions and contractions in the level of general economic activity does not require trend estimation and elimination, but a study of growth cycles defined as sequences of high and low growth phases does. Major cyclical slowdowns and booms deserve to be analyzed along with classical recessions and expansions, but the needed time series decomposition presents difficult problems, mainly because trends and cycles influence each other. We compare cyclical movements in levels, deviations from trend, and smoothed growth rates of the principal measures of aggregate economic activity - the quarterly real GDP and the monthly U.S. Coincident Index - using the phase average trend (PAT). Then we compare alternative trend estimates, deterministic a...

Published: Zarnowitz, Victor & Ozyildirim, Ataman, 2006. "Time series decomposition and measurement of business cycles, trends and growth cycles," Journal of Monetary Economics, Elsevier, vol. 53(7), pages 1717-1739, October. citation courtesy of

August 2001The Composite Index of Leading Economic Indicators: How to Make It More Timely
with Robert H. McGuckin, Victor Zarnowitz: w8430
A major shortcoming of the U.S. leading index is that it does not use the most recent information for stock prices and yield spreads. The index methodology ignores these data in favor of a time-consistent set of components (i.e., all of the components must refer to the previous month). An alternative is to bring the series with publication lags up-to-date with forecasts and create an index with a complete set of most recent components. This study uses tests of ex-ante predictive ability of the U.S. leading index to evaluate the gains to this new 'hot box' procedure of statistical imputation. We find that, across a variety of simple forecasting models, the new approach offers substantial improvements.
December 1998Trade, Investment, and Growth: Nexus, Analysis, and Prognosis
with Kala Krishna, Norman R. Swanson: w6861
This paper looks at the patterns of causation between income, export, import, and investment growth for 25 developing countries. Our approach differs from previous efforts in a number of ways. First, we examine each country individually in order to allow for complete heterogeneity and properly account for the stochastic trending properties of the data. Second, we apply novel model selection techniques which are based on in-sample goodness-of-fit criteria and ex-ante predictive ability criteria to identify the best model for each country. Finally, we propose a rather novel device based on simple contingency tables which allows us to assess whether our models are capable of accurately predicting turning points in GDP growth. We find that countries with high trade exposure fare poorly in...

Published: Krishna, Kala & Ozyildirim, Ataman & Swanson, Norman R., 2003. "Trade, investment and growth: nexus, analysis and prognosis," Journal of Development Economics, Elsevier, vol. 70(2), pages 479-499, April. citation courtesy of

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