title: Recombining a list of Data.frames into a single data frame
body: <p>I am sorry if this question has been answered already. Also, this is my first time on stackoverflow. </p>
  
  <p>I have a beginner R question concerning lists , data frames and <code>merge()</code> and/or <code>rbind()</code>. </p>
  
  <p>I started with a Panel that looks like this </p>
  
  <pre><code>COUNTRY YEAR VAR
  A         1
  A         2
  B         1
  B         2
  </code></pre>
  
  <p>For efficiency purposes, I created a list that consists of one data frame for each country and performed a variety of calculations on each individual <code>data.frame</code>. However, I cannot seem to combine the individual data frames into one large frame again. </p>
  
  <p><code>rbind()</code> and <code>merge()</code> both tell me that only replacement of elements is allowed. </p>
  
  <p>Could someone tell me what I am doing wrong/ and how to actually recombine the data frames?</p>
  
  <p>Thank you</p>