as.data.frame.by: no visible global function definition for 'na.omit'
autoplot.microbenchmark : uq: no visible global function definition for
  'quantile'
autoplot.microbenchmark : lq: no visible global function definition for
  'quantile'
autoplot.microbenchmark: no visible global function definition for
  'ggplot'
autoplot.microbenchmark: no visible global function definition for
  'aes'
autoplot.microbenchmark: no visible binding for global variable 'time'
autoplot.microbenchmark: no visible global function definition for
  'coord_cartesian'
autoplot.microbenchmark: no visible global function definition for
  'stat_summary'
autoplot.microbenchmark: no visible binding for global variable
  'median'
autoplot.microbenchmark: no visible global function definition for
  'opts'
autoplot.microbenchmark: no visible global function definition for
  'theme_text'
bin: no visible global function definition for 'quantile'
compareplot: no visible global function definition for 'grid.newpage'
compareplot: no visible global function definition for
  'latticeParseFormula'
compareplot: no visible global function definition for 'pushViewport'
compareplot: no visible global function definition for 'viewport'
compareplot: no visible global function definition for 'grid.layout'
compareplot: no visible global function definition for 'unit'
compareplot: no visible global function definition for 'seekViewport'
compareplot: no visible global function definition for 'grid.rect'
compareplot : makeNat: no visible global function definition for
  'convertUnit'
compareplot: no visible global function definition for 'grid.text'
compareplot: no visible global function definition for 'gpar'
compareplot: no visible global function definition for 'quantile'
compareplot: no visible global function definition for 'grid.lines'
compareplot: no visible global function definition for 'grid.points'
compareplot: no visible global function definition for 'median'
compareplot: no visible global function definition for 'sd'
compareplot: no visible global function definition for 'grid.polyline'
compareplot: no visible global function definition for 'upViewport'
compareplot: no visible global function definition for 'convertUnit'
compareplot: no visible global function definition for 'popViewport'
hist_horiz: no visible global function definition for
  'latticeParseFormula'
hist_horiz: no visible global function definition for 'quantile'
hist_horiz: no visible global function definition for 'par'
hist_horiz: no visible global function definition for 'barplot'
homogenous: no visible global function definition for 'sd'
latex.table.by: no visible global function definition for 'xtable'
panel.densityplot.enhanced: no visible global function definition for
  'panel.densityplot'
panel.densityplot.enhanced: no visible global function definition for
  'unit'
panel.densityplot.enhanced: no visible global function definition for
  'grid.text'
panel.densityplot.enhanced: no visible global function definition for
  'gpar'
panel.densityplot.enhanced: no visible global function definition for
  'sd'
panel.ecdf: no visible global function definition for 'panel.xyplot'
panel.ecdf: no visible global function definition for 'ecdf'
panel.ecdf: no visible global function definition for 'panel.lines'
panel.xyplot_rug: no visible global function definition for
  'panel.xyplot'
panel.xyplot_rug: no visible global function definition for
  'grid.segments'
panel.xyplot_rug: no visible global function definition for 'unit'
panel.xyplot_rug: no visible global function definition for 'gpar'
quantile_cutpoints: no visible global function definition for
  'quantile'
searchPattern: no visible global function definition for 'interleave'
sides.formula : isOneSided: no visible global function definition for
  'terms'
title.page.new: no visible global function definition for 'plot.new'
title.page.new: no visible global function definition for 'text'
write.sanitized.csv: no visible global function definition for
  'write.csv'
xtable.CrossTable: no visible global function definition for
  'caption<-'
xtable.CrossTable: no visible global function definition for 'label<-'
xtable.CrossTable: no visible global function definition for 'align<-'
xtable.CrossTable: no visible global function definition for 'digits<-'
xtable.CrossTable: no visible global function definition for
  'display<-'
xtable.summary.lme: no visible global function definition for
  'caption<-'
xtable.summary.lme: no visible global function definition for 'label<-'
xtable.summary.lme: no visible global function definition for 'align<-'
xtable.summary.lme: no visible global function definition for
  'digits<-'
xtable.summary.lme: no visible global function definition for
  'display<-'
xtablelm: no visible global function definition for 'xtable'
xtablelm: no visible global function definition for 'pf'
Undefined global functions or variables:
  aes align<- barplot caption<- convertUnit coord_cartesian digits<-
  display<- ecdf ggplot gpar grid.layout grid.lines grid.newpage
  grid.points grid.polyline grid.rect grid.segments grid.text
  interleave label<- latticeParseFormula median na.omit opts
  panel.densityplot panel.lines panel.xyplot par pf plot.new
  popViewport pushViewport quantile sd seekViewport stat_summary terms
  text theme_text time unit upViewport viewport write.csv xtable
Consider adding
  importFrom("graphics", "barplot", "par", "plot.new", "text")
  importFrom("stats", "ecdf", "median", "na.omit", "pf", "quantile",
             "sd", "terms", "time")
  importFrom("utils", "write.csv")
to your NAMESPACE file.