title: Time series Moving average model
body: <p>After a lot of time series exploration, I have a very trivial doubt.</p>
  
  <p>In a Moving average model, where is the error term coming from. What is being subtracted from each value to get these errors, is it the first value in the series or any expected value? </p>
  
  <p>For instance let's take an MA(1) model - <code>xt=μ+wt+θ1wt−1</code>; For <code>x1</code> what are <code>w1</code> and <code>w0</code>. </p>