Ítalo Gomes Gonçalves

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Questions related from Ítalo Gomes Gonçalves

How is it possible to design a custom covariance/kernel function and ensure its positive definiteness?

In kernel-based learning, the covariance/kernel matrix defines the properties of the function being modeled from the data (smoothness, boundedness, etc.). How can I design a covariance function...

03 March 2018 1,360 1 View

Are there any pitfalls one should be aware of when using maximum likelihood?

When estimating a given model's parameters, is there any condition that makes maximum likelihood undesirable and/or inneficient? In such a case, which would be the better method?

10 October 2016 7,833 5 View

Is there a mathematical definition of a mixed compositional and non-compositional products under the framework of compositional data analysis?

Suppose a D-dimensional vector V which is compositional in nature, while vector U is not. The scalar product U x V is defined in Euclidean space, but is there any way to compute the same product...

05 May 2015 3,687 7 View

Is there any standard methodology for modeling geological structures?

Recently there has been a trend to research somewhat automatic tools for determining lithologic contacts, volume, shape, etc. for mining applications, most of them based on geostatistics and/or...

01 January 2015 1,816 8 View