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中文摘要：
本文利用汉森（Hansen）门槛回归分析的方法，从R＆D强度、产业结构两个角度研究了1978-2012年我国R＆D投入增长与经济增长之间的阶段性交化特点。实证结果显示，当R＆D强度越过门槛后，R＆D资本增长对经济增长的作用在不断加强；当工定占GDP比重越过门槛后，R＆D资本增长对经济增长的作用由不显著转变为显著为正；但当第三产业占GDP比重越过门槛后，R＆D资本增长对经济增长的作用却由显著为正转变为不显著。
英文摘要：
This paper uses the threshold regression method by Hansen （2000） to measure the threshold effects of R＆D investment and economic growth from the perspective of R＆D intensity and industrial structure between 1978 and 2012. This analysis shows there are regime-switching. With the R＆D intensity increasing, the effect of R＆D investment on economic growth is stronger and stronger. With the proportion of industry in GDP increasing, the effect becomes from non-significant to significant. However, with the proportion of the third industry in GDP increasing, the effect becomes from significant to non-significant.
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