Error(s) in re-building vignettes:
--- re-building ‘analysis_normal.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Loading required package: lattice
Loading required package: mvtnorm
Quitting from lines 60-67 (analysis_normal.Rmd) 
Error: processing vignette 'analysis_normal.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘analysis_normal.Rmd’

--- re-building ‘binary_data.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 66-70 (binary_data.Rmd) 
Error: processing vignette 'binary_data.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘binary_data.Rmd’

--- re-building ‘faq.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
--- finished re-building ‘faq.Rmd’

--- re-building ‘mult_regimen.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 71-109 (mult_regimen.Rmd) 
Error: processing vignette 'mult_regimen.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘mult_regimen.Rmd’

--- re-building ‘overview.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 39-55 (overview.Rmd) 
Error: processing vignette 'overview.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘overview.Rmd’

--- re-building ‘sample_size.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 23-29 (sample_size.Rmd) 
Error: processing vignette 'sample_size.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘sample_size.Rmd’

SUMMARY: processing the following files failed:
  ‘analysis_normal.Rmd’ ‘binary_data.Rmd’ ‘mult_regimen.Rmd’
  ‘overview.Rmd’ ‘sample_size.Rmd’

Error: Vignette re-building failed.
Execution halted