Namespaces in Imports field not imported from:
  ‘RColorBrewer’ ‘ggplot2’ ‘knitr’ ‘markdown’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘RColorBrewer’ ‘ggplot2’ ‘knitr’ ‘markdown’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘RColorBrewer’ ‘ggplot2’ ‘knitr’ ‘markdown’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘RColorBrewer’ ‘ggplot2’ ‘knitr’ ‘markdown’
  All declared Imports should be used.