季节变动指数，简称季节指数，它是预测目标季节或某月受季节变动因素影响发生变动的比例。
季节变动指数(SVI)用来拟合电力负荷的季节性趋势。
The seasonal variation index (SVI) is used to fit the seasonal trend of power load.
提出灰色GM(1.1)用电最预测模型的改进模型——灰色季节变动指数模型GSI(1,1)模型，将灰色预测方法与季节指数有机结合起来。
The paper proposes the improved model of GM (1, 1) model which is called GSI (1, 1). GSI (1, 1) model is the combi - nation of grey system and seasonal index.
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