title: stripchart by groups in R
body: <p>I am still a newbie to R and would like to ask for help in graphing stripcharts. </p>
  
  <pre><code>stripchart(Study_intensive$AGE, method="stack",
  at=c(0.05), pch=20, cex=2, xaxt="n", frame.plot=F, main= "Age Range in weight group(yr)")
  axis(1, at=seq(0, 75, by=5) , labels= seq(0, 75, by=5),  
  cex.axis=0.75)
  </code></pre>
  
  <p>This is my code at the moment and I am trying to group it by another column called "weightclass";  Basically using another color for each weightclass. "weightclass" has 4 values: 1, 2, 3, 4 respectively. Is there something I can do to easily do so? </p>
  
  <p>Thank you for the help!  </p>