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The regression example (2.1.1 Simple Regression)

states y = β_{0} + β _{1} ∗ x + ϵ

Then in the text below the parameters are called " β0 , β1 , σ2, ϵ , and the mean and variance of x".

And then in the diagram we see σ^{2}_{x} ,σ^{2}_{y}, β_{y}, β_{yz} and μ_{x}.

Much easier to follow with one set of conventions rather than three. And where mapping of conventions is necessary, it should be explicit (i.e., "and the mean and variance of x (μ_{x} and σ^{2}_{x} respectively) )"