title: Explain ggplot2 warning: "Removed k rows containing missing values"
body: <p>I get this warning when I am trying to generate a plot with <code>ggplot</code>.</p>
  
  <p>After researching online for a while many suggested that my database contains either null values or missing data in general, which was not the case.</p>
  
  <p><a href="https://stackoverflow.com/questions/21549463/the-meaning-of-warning-message-removed-4-rows-containing-missing-values-geom-p">In this question</a> the accepted answer says the following:</p>
  
  <blockquote>
    <p>The warning means that some elements are removed because they fall out of the specified range</p>
  </blockquote>
  
  <p>I was wondering what exactly does this range refer to and how can someone manually increase this range in order to avoid all warnings?</p>