How to write y i = β 0 + β 1 x i + β 2 x 2 i + e i in Latex code?

Question

I'm a beginner of using R and Latex. Just wonder how to write yi = β0 + β1xi + β2x2i + ei by using Latex?

Answer 1

Just guessing…

\documentclass{article}
\begin{document}
$y_i = \beta_0 + \beta_1 x_i + \beta_2 x_i^2 + e_i$
\end{document}