Error(s) in re-building vignettes:
  ...
--- re-building ‘papeR_introduction.Rmd’ using rmarkdown
Loading required package: car
Loading required package: carData
Loading required package: xtable
Registered S3 method overwritten by 'papeR':
  method    from
  Anova.lme car 

Attaching package: 'papeR'

The following object is masked from 'package:utils':

    toLatex

Factors are dropped from the summary
Factors are dropped from the summary
Factors are dropped from the summary
Factors are dropped from the summary
Factors are dropped from the summary
--- finished re-building ‘papeR_introduction.Rmd’

--- re-building ‘papeR_with_latex.Rnw’ using knitr
Factors are dropped from the summary
NOTE: Output requires \usepackage{booktabs} in your preamble.
Factors are dropped from the summary
NOTE: Output requires \usepackage{booktabs} in your preamble.
Factors are dropped from the summary
NOTE: Output requires \usepackage{booktabs} in your preamble.
Factors are dropped from the summary
NOTE: Output requires \usepackage{booktabs} in your preamble.
NOTE: Output requires \usepackage{booktabs} in your preamble.
Non-factors are dropped from the summary
NOTE: Output requires \usepackage{booktabs} in your preamble.
NOTE: Output requires \usepackage{longtable} in your preamble.
NOTE: Output requires \usepackage{booktabs} in your preamble.
NOTE: Output requires \usepackage{booktabs} in your preamble.
NOTE: Output requires \usepackage{booktabs} in your preamble.
NOTE: Output requires \usepackage{capt-of} in your preamble.
Error: processing vignette ‘papeR_with_latex.Rnw’ failed with diagnostics:
Running ‘texi2dvi’ on ‘papeR_with_latex.tex’ failed.
LaTeX errors:
! Missing $ inserted.
<inserted text> 
                $
l.275 Ortho_
            small <- subset(Orthodont,
! Emergency stop.
<inserted text> 
                $
l.275 Ortho_
            small <- subset(Orthodont,
!  ==> Fatal error occurred, no output PDF file produced!
--- failed re-building ‘papeR_with_latex.Rnw’

SUMMARY: processing the following file failed:
  ‘papeR_with_latex.Rnw’

Error: Vignette re-building failed.
Execution halted