Gaussian Model
The Gaussian Model is applied to samples which are very continuous. It is similar to the Exponential Model. However, the Gaussian Model starts from a parabolic curve, and this curve has an inflection point. The formula of Exponential Model is:
Where
, 
. It means when 
, 
. Then the effective range of the Gaussian Model is
. When
=0 and C=1, the model is called Standard Gaussian Model.
Compared with the above 3 models, the Spherical Model has the smallest effective range, the Exponential Model has the biggest effective range, and the effective range of the Gaussian Model is in between. The Spherical and Exponential Models both have a tangent passing through the point of origin, but the Gaussian Model has no tangent.
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