عنوان مقاله [English]
نویسندگان [English]چکیده [English]
In this article using Autoregressive (AR), Autoregressive conditional heteroskedasticity (ARCH), Generalized autoregressive conditional heteroskedasticity (GARCH) Models we assess the weekend effect and also compare the trading patterns of individual and legal investors during 1381-1385 in Tehran stock exchange. Our findings suggest that weekend effect exists in Tehran stock exchanges which are in contrast with the observed effect in the other countries stock exchange. In other stock exchanges, one of the reasons for generating the weekend effect is individual trading patterns while in Tehran stock exchange it seems both of individual and legal investor's behaviors are the main reason for this effect.