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yeluping至尊木虫 (著名写手)
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[求助]
半变异函数
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各位老师，想请教一个关于半变异函数的问题： 半变异函数的nugget/sill一般划分为：<25%强的空间相关性，25-50% 中等强，50-75% 中等弱，>75%弱。 我的半变异函数包括spherical，exponential，Gaussian三种模型，就放在一起根据nugget/sill的大小判断其空间相关性的强弱，结果老师指出：由spherical，exponential，Gaussian模型得到的nugget/sill是不同的，不能放在一起比较（不知道这样理解对不对，所以将老师的原话贴在下面），请问这个是什么意思啊？因为我看文献里面没有将不同模型的nugget/sill分开比较的。非常感谢了。 老师的原话： The nugget-sill ratio needs to be handled with more care. You are using different types of models. Only for the spherical model, you have a clear transition between structured variability and the plateau. However, in the exponential and Gaussian models, the range is not exactly located at such a transition because in these models there is none. Aslo, the C0 + C (sill) is only a parameter but does not reflect an exact sill. Beyond the range parameter in these exponential-type models, the semivariance still increases further. Therefore, a nugget-sill ratio derived from spherical model parameters is different than one derived from an exponential or a Gaussian model! |
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