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$$y = f(x, \theta) + g*\epsilon$$, this part is considered in class Response
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$$f(x, \theta)$$, this part is considered in class Response
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$$\theta={(\mu, \omega)}$$, this part is considered in class ModelParameter
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$$\epsilon$$, this is a slot of the object NormalDistribution
with mean = 0 and covariate_matrix = I