itemDescriptives : <anonymous>: no visible global function definition
  for ‘cor’
itemFitPlot: no visible global function definition for ‘dev.new’
itemFitPlot: no visible global function definition for ‘jpeg’
itemFitPlot: no visible global function definition for ‘png’
itemFitPlot: no visible global function definition for ‘polygon’
itemFitPlot: no visible global function definition for ‘text’
itemFitPlot: no visible global function definition for ‘abline’
itemFitPlot: no visible global function definition for ‘dev.off’
mixRasch: no visible global function definition for ‘flush.console’
person.reports: no visible global function definition for ‘na.omit’
personItemPlot: no visible global function definition for ‘hist’
personItemPlot: no visible global function definition for ‘dev.new’
personItemPlot: no visible global function definition for ‘jpeg’
personItemPlot: no visible global function definition for ‘png’
personItemPlot: no visible global function definition for ‘axis’
personItemPlot: no visible global function definition for ‘barplot’
personItemPlot: no visible global function definition for ‘legend’
personItemPlot: no visible global function definition for ‘dev.off’
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’
rICC: no visible global function definition for ‘na.omit’
rICC: no visible global function definition for ‘jpeg’
rICC: no visible global function definition for ‘png’
rICC: no visible global function definition for ‘points’
rICC: no visible global function definition for ‘dev.off’
Undefined global functions or variables:
  abline axis barplot complete.cases cor dev.new dev.off dnorm
  flush.console hist jpeg legend na.omit optim png pnorm points polygon
  qnorm sd text
Consider adding
  importFrom("grDevices", "dev.new", "dev.off", "jpeg", "png")
  importFrom("graphics", "abline", "axis", "barplot", "hist", "legend",
             "points", "polygon", "text")
  importFrom("stats", "complete.cases", "cor", "dnorm", "na.omit",
             "optim", "pnorm", "qnorm", "sd")
  importFrom("utils", "flush.console")
to your NAMESPACE file.