cttICC: no visible global function definition for 'na.omit'
cttICC: no visible global function definition for 'jpeg'
cttICC: no visible global function definition for 'png'
cttICC: no visible global function definition for 'plot'
cttICC: no visible global function definition for 'points'
cttICC: no visible global function definition for 'dev.off'
distractor.analysis: no visible global function definition for
  'quantile'
distractor.analysis : itemtab: no visible global function definition
  for 'xtabs'
distractor.analysis : itemtabp: no visible global function definition
  for 'xtabs'
distractor.analysis: no visible global function definition for
  'write.table'
polyserial: no visible global function definition for 'complete.cases'
polyserial: no visible global function definition for 'qnorm'
polyserial: no visible global function definition for 'cor'
polyserial: no visible global function definition for 'sd'
polyserial: no visible global function definition for 'dnorm'
polyserial : negLogLik: no visible global function definition for
  'pnorm'
polyserial : negLogLik: no visible global function definition for
  'dnorm'
polyserial: no visible global function definition for 'optim'
reliability: no visible global function definition for 'na.omit'
reliability: no visible binding for global variable 'var'
reliability: no visible global function definition for 'var'
reliability: no visible global function definition for 'cor'
reliability: no visible global function definition for 'sd'
score.transform: no visible global function definition for 'qnorm'
score.transform: no visible global function definition for 'sd'
Undefined global functions or variables:
  complete.cases cor dev.off dnorm jpeg na.omit optim plot png pnorm
  points qnorm quantile sd var write.table xtabs
Consider adding
  importFrom("grDevices", "dev.off", "jpeg", "png")
  importFrom("graphics", "plot", "points")
  importFrom("stats", "complete.cases", "cor", "dnorm", "na.omit",
             "optim", "pnorm", "qnorm", "quantile", "sd", "var", "xtabs")
  importFrom("utils", "write.table")
to your NAMESPACE file.