purpose: to study the effects of adding intravitreal bevacizumab (avastin) to conventional laser treatment on regression of retinal neovascularization in threshold rop. methods: intravitreal injection of bevacizumab (1.25 mg) in one eye of each of three newborns with threshold rop was performed in addition to laser treatment. the other eye of each patient was treated with laser alone. changes i...

We apply the two-sector production function developed by Ram (1986) to estimate the threshold regression model for Iran, concerning the effect of government size on economic growth. Three government size indicators are used to find out the different threshold points. The results show a non-linear relationship of the Armey curve in Iran, in which the threshold effects corresponding to total gove...

Laffer curve indicates relationship between tax rate and tax income. The aim of this paper is estimating of laffer curve in Iranian economy. To do so, we have used threshold regression method. Empirical results indicate that since the tax rate is low (the threshold value is less than 0.0848) in two-regime model, tax rate and tax income have a significant positive relationship, but when the tax ...