title: Plotting a time series in R using ggplot2,
body: <p>I'm try to create a time series where, <code>x = year</code>, <code>y = cpue_wt</code>, grouped by station.  I have 7 stations:  Here is a snapshot of the data, which goes from 1986-2011.  I want one plot, with 7 different lines, each represents one station through time. </p>
  
  <pre><code>year  station     cpue_wt
  1986    531 3.400346954
  1986    537 1.292539282
  1986    538 1.097930493
  1986    541 1.220753481
  1986    550 1.350880331
  1986    552 1.168257879
  1986    555 2.012733899
  1987    531 1.817902609
  1987    537 2.024999967
  1987    538 1.563596954
  </code></pre>
  
  <p>Here is the code I'm trying to use:</p>
  
  <pre><code>SST &lt;- ggplot(Yrsta, aes(group = factor(station), x = year, y = cpue_wt, colour = station)) + geom_line() + scale_color_manual(values=c("#999999", "#E69F00", "#56B4E9", "#009E73", "#F0E442", "#0072B2", "#D55E00"))
  </code></pre>
  
  <p>Here is my error:</p>
  
  <pre><code>Continuous value supplied to discrete scale
  </code></pre>
  
  <p>I'm assuming my data are not organized correctly.</p>
  
  <p>Any help would be greatly appreciated.</p>