subtle ggplot2 techniques

  1. His­tograms (geom_his­togram) dis­play the count with bars;
    fre­quen­cy poly­gons (geom_fre­qpoly), dis­play the counts with lines.
  2. how to remove extra base line in ggplot2-den­si­ty plots? (https://groups.google.com/forum/#!topic/ggplot2/I3fXMH8foEs) ggplot(a,aes(x=V1))+geom_density() = ggplot(a,aes(x=V1))+geom_line(stat=“density”)

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