# 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.)

## marked as duplicate by gung♦, kjetil b halvorsen, Harvey Motulsky, Nick Cox, StasKJan 26 '15 at 20:12

• I think this may be written incorrectly. I believe it should be $\gamma_1\sqrt{x}$, correct? – StatsStudent Jan 26 '15 at 17:42
• @StatsStudent, that is a reasonable guess. The model as stated is clearly unidentifiable. However, I just added $\TeX$, I didn't add the "$+$". – gung Jan 26 '15 at 17:43