The presupposition of water rights transaction is distribution differentiation of space-time, non-equilibrium of supply-demand and marginal return rate differentiation of water rights owners.
水资源时空分布的差异性、供求的不均衡性和水权主体边际资源回报率的差异，是水权交易制度存在的前提和基础。
Non-discounting methods includes payback period and accounting rate of return.
非折现的方法有回收期法和会计收益率法。
According to statistical analysis on Shanghai stock index, the distribution of the rate of return is non-positive skewed, and there exists an autoregressive heteroskedasticity in the rate of return.
通过对上证指数的统计分析表明，上证指数的收益率分布表现出非正态性，并存在自回归条件异方差的特征。
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