title: ggplot2 geom_bar position = "dodge" does not dodge
body: <p>I have the dataframe p3 below:</p>
  
  <pre><code>         test     result
      1      1    26.87778
      2      1    24.52598
      3      1    24.02202
      4      1    20.32632
      5      1    22.00618
      6      2    19.84013
      7      2    19.68983
      8      2    19.84013
      9      2    19.23892
      10     2    19.23892
      11     3    34.36430
      12     3    33.28196
      13     3    33.82313
      14     3    33.82313
      15     3    32.47020
      16     4    25.55169
      17     4    26.90442
      18     4    25.40138
      19     4    24.19895
      20     4    25.85230
      21     4    25.70199
      22     4    24.95047
      23     5    18.64646
      24     5    18.64646
      25     5    17.80653
      26     5    18.64646
      27     5    18.31049
  </code></pre>
  
  <p>I am trying to make a barchart with dodged results using the code:</p>
  
  <pre><code>    ggplot(p3, aes(x = test, y = result))+ geom_bar(position="dodge", stat="identity")
  </code></pre>
  
  <p>but it doesn't work at all. I don't understand why it is not working since I used the same code before and it worked.</p>