R: How to fit a time series model such as "Y(t) = αX + βY(t-1)"?
<p>How do I fit this model in R, step by step? My scope is to make a forecast for t+1.</p>

<h2>Y(t) = αX(t) + βY(t-1)</h2>

<ul>
<li><em>Y(t) &lt;- years from 1900 to 2000.</em></li>
<li><em>X &lt;- a score measure from 0 to 100.</em></li>
<li><em>Y(t-1) &lt;- lagged value of order 1 for Y.</em></li>
</ul>

<p>Thanks in advance.</p>