The approaches of transformation include trend extrapolation, international comparisons approach and employee interview survey and so on.
转换的方法可以包括趋势外推法、国际比较法以及雇主访谈法等。
Furthermore, trend extrapolation is used to forecast the developing trend and orientation of Ningxia tourism industry.
进一步运用趋势外推法，预测了宁夏旅游业近期的发展趋势及走向。
Finally, a comparison of the results is made, which shows that the prediction result of the combined model based on trend extrapolation and ARMA is not only more accurate, but also more stable.
最后通过比较得出趋势外推与ARMA组合模型的预测结果不仅准确性高、而且稳定性好这一结论。
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