Hi,

 

I would like a few opinions on the definition of the “nugget effect”.

 

The value at the point at which a variogram model intersects the vertical (gamma) axis on a variogram plot is often called the “nugget effect”. I have however, seen this definition being described as erroneous, and that this value is actually the “nugget variance”.

 

The “nugget effect” is described as the ratio of the random component of grade variation to the spatial component of grade variation, or in other words (assuming a model with 3 nested structures):

 

Nugget Effect = C0 / C1+C2+C3

 

Does anyone have any comments regarding this?

 

Regards,

Colin

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