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Calendar has remarkable effectes on the formation of economic activities. In Iran both lunar and solar calendars have been accepted. Each of these calendars has considerable effects on the economic activities in turn. To consider the calendar effects, this paper aims at providing a time series model in the framework of Box and Jenkins approach for the prediction of red meat, chicken and eggs prices in the urban areas of Iran. The utilized data consist of the monthly time series of the variables and some dummy variables to considering the calendar effects. In the recognition of the integration order of studied variables, the technique of beaulien and Miron (1993) is employed. None of the considered variables were nonstationary, but some of calendar effects were significant.
JEL Classification: C53, C49