itemanal: no visible global function definition for 'na.omit'
itemanal: no visible global function definition for 'var'
itemanal: no visible binding for global variable 'median'
itemanal: no visible binding for global variable 'var'
itemanal: no visible global function definition for 'cov'
itemanal: no visible global function definition for 'cor'
itemanal : if.deleted.variance: no visible global function definition
  for 'var'
itemanal : item.cor: no visible global function definition for 'cor'
itemanal : r.if.del: no visible global function definition for 'lm'
itemanal : del.alpha: no visible binding for global variable 'var'
itemanal : del.alpha: no visible global function definition for 'var'
itemanal : boot.one : func: no visible global function definition for
  'cov'
itemanal : boot.one: no visible global function definition for 'sd'
itemanal : boot.two : func: no visible global function definition for
  'cor'
itemanal : boot.two: no visible global function definition for 'sd'
paf: no visible global function definition for 'na.omit'
paf: no visible global function definition for 'var'
paf: no visible global function definition for 'cor'
plot.itemanal: no visible global function definition for 'dev.new'
plot.itemanal: no visible global function definition for 'stars'
plot.itemanal: no visible global function definition for 'legend'
plot.itemanal: no visible global function definition for 'locator'
plot.itemanal: no visible global function definition for 'axis'
plot.itemanal : plot.multi.dens: no visible global function definition
  for 'density'
plot.itemanal : plot.multi.dens: no visible global function definition
  for 'lines'
plot.itemanal: no visible global function definition for 'abline'
plot.paf: no visible global function definition for 'dev.new'
plot.paf: no visible global function definition for 'par'
plot.paf: no visible global function definition for 'axis'
plot.paf: no visible global function definition for 'abline'
plot.paf: no visible global function definition for 'mtext'
plot.paf: no visible global function definition for 'points'
plot.paf: no visible global function definition for 'legend'
plot.paf: no visible global function definition for 'locator'
Undefined global functions or variables:
  abline axis cor cov density dev.new legend lines lm locator median
  mtext na.omit par points sd stars var
Consider adding
  importFrom("grDevices", "dev.new")
  importFrom("graphics", "abline", "axis", "legend", "lines", "locator",
             "mtext", "par", "points", "stars")
  importFrom("stats", "cor", "cov", "density", "lm", "median", "na.omit",
             "sd", "var")
to your NAMESPACE file.