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Refers to any model where a random variable is related to one or more random variables by a function that is linear in a finite number of parameters.
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Is a model including a square root of a variable linear in the parameters? [duplicate]
Is the model
$$
y = \gamma_0 + \gamma_1 + \sqrt x + \varepsilon
$$
linear in parameters? ( $\varepsilon$ is the error term.)