title: Use dodge with geom_point and error bar to horizontally display coefficients from models
body: <p>Let's say I have the following data-set</p>
  
  <pre><code>                                 term  estimate std.error statistic      p.value   conf.low conf.high  df                outcome model
                      outgroup_pairing1  9.173850  2.336151  3.926908 0.0001574491   4.539555 13.808145 101 outgroup_feelings_diff     1
                      outgroup_pairing1 11.663866  3.330378  3.502265 0.0006886152   5.057292 18.270440 101 outgroup_feelings_diff     2
   politicsRepublican:outgroup_pairing1 -5.002525  4.645316 -1.076897 0.2840919026 -14.217582  4.212531 101 outgroup_feelings_diff     2
                      outgroup_pairing1 10.657113  3.575874  2.980282 0.0036079930   3.563540 17.750686 101 outgroup_feelings_diff     3
   politicsRepublican:outgroup_pairing1 -4.928449  4.647266 -1.060505 0.2914443020 -14.147374  4.290476 101 outgroup_feelings_diff     3
                      outgroup_pairing1 10.512772  4.162351  2.525681 0.0131016794   2.255788 18.769757 101 outgroup_feelings_diff     4
   politicsRepublican:outgroup_pairing1 -5.359123  4.978743 -1.076401 0.2843123953 -15.235609  4.517363 101 outgroup_feelings_diff     4
  </code></pre>
  
  <p>I want to be able to output the main effect and the interaction coefficients and their attendant error bars, grouped by the model number.  Here is my best attempt:</p>
  
  <pre><code>ggplot(aes(x = estimate, y = model, color = term, group= term)) + 
  geom_vline(xintercept = 0, linetype = 2) + 
  geom_point(position="dodge") + 
  geom_errorbarh(aes(xmin = conf.low, xmax = conf.high, height = 0.1),position="dodge") + 
  ggtitle("Change in Outgroup Warmth") + 
  geom_text(aes(label = paste("β = ", round(estimate, 2), "; p = ", round(p.value, 5)), vjust = -.5)) +
  theme_bw() +  
  theme(plot.title = element_text(hjust = 0.5)) +
  ylab("Model")  +
  xlab("Estimate")
  </code></pre>
  
  <p>But this yields the following. </p>
  
  <p><a href="https://i.stack.imgur.com/5ioAA.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5ioAA.png" alt="enter image description here"></a></p>
  
  <p>I want the coefficients horizontally "dodged" so they don't overlap like that.  I'd also like the "a" in the legend to be removed. </p>