Seite 242 Tajdini, Mollahassani, Roohnia, Latibari 129. Jahrgang (2012), Heft 3-4, S. 242–258 Assessment of the effective factors on sawn wood import in Iran Ajang Tajdini 1 *, Amir Mollahassani 1 , Mehran Roohnia 1 ,Ahmad Jahan Latibari 1 Keywords: Lumber, Import, Cointegration, Granger causality test, Stationa- rity, Ordinary Least Square model Abstract The import of sawn wood in Iran for the period of 1984 to 2009 is empi- rically analyzed using a Ordinary Least Square model (OLS).the stationary character of the data was checked by applying the Augmented Dickey-Ful- ler (ADF) and Philips-Perron tests. Also, Breusch-Godfrey test was used for testing the presence of serial autocorrelation in the error term of the re- gression model. The presence of a long-run relationship between demand for the sawn wood import and the affective factors was measured applying Engle–Granger and Johansen-Julius cointegration tests and finally the short run causal relation was analyzed by the causality test of Granger. The results indicate that the nominal exchange rate and domestic production quantity variables impart adverse impact on this commodity import and GDP and the 1 Ajang Tajdini*: Associated Professor at: Department of Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University – Karaj, Iran *Corresponding Author: E-mail: ajang.tajdini@kiau.ac.ir, Office: +98 261 3203575 , Fax: + 98 261 3203575, Department of Wood and Paper Science and Technology, Faculty of Agriculture and Natural Resources, Karaj Branch, Islamic Azad University, P.O. BOX 31485-313 , Karaj , Iran 2 Amir Mollahassani: Ms.c in wood and paper Science and Technology, Department of Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University -Karaj, Iran, E-mail: Amirml86@yahoo.com 3 Mehran Roohnia: Associated Professor at: Department of Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University – Karaj, Iran, E-mail: mroohnia@gmail.com 4 Ahmad Jahan Latibari: Professor at: Department of Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University – Karaj, Iran, E-mail: latibari.aj@gmail.com