Disp.link: no visible global function definition for 'colors'
Disp.link: no visible global function definition for 'dev.cur'
Disp.link: no visible global function definition for 'dev.set'
Disp.link: no visible global function definition for 'points'
Disp.link: no visible global function definition for 'title'
Disp.link: no visible global function definition for 'identify'
Disp.link: no visible global function definition for 'lines'
Disp.link: no visible global function definition for 'dev.off'
Falternate3: no visible global function definition for 'dev.cur'
Falternate3: no visible global function definition for 'dev.set'
Falternate3: no visible global function definition for 'par'
Falternate3: no visible global function definition for 'rnorm'
Falternate3: no visible global function definition for 'var'
Falternate3: no visible global function definition for 'points'
Falternate3: no visible global function definition for 'text'
Fmdsfit3: no visible global function definition for 'nlm'
Ftransdraw: no visible global function definition for 'par'
Ftransdraw: no visible global function definition for 'text'
Ftransdraw: no visible global function definition for 'lines'
Ftransdraw: no visible global function definition for 'title'
Ftransdraw: no visible global function definition for 'locator'
Ftransdraw: no visible global function definition for 'abline'
Ftransdraw: no visible global function definition for 'points'
Fvariogfit3: no visible global function definition for 'nlm'
draw: no visible global function definition for 'points'
draw: no visible global function definition for 'lines'
draw: no visible global function definition for 'matlines'
drinteg: no visible global function definition for 'locator'
plotCoordChange: no visible global function definition for 'text'
plotCoordChange: no visible global function definition for 'symbols'
plotCoordChange: no visible global function definition for 'arrows'
plotCoordChange: no visible global function definition for 'title'
plotCoordChange: no visible global function definition for 'par'
plotDispersionDist: no visible global function definition for 'title'
plotDispersionDist: no visible global function definition for 'abline'
plotDispersionDist: no visible global function definition for 'lines'
plotDispersionDist: no visible global function definition for 'points'
pred.dist.simul: no visible global function definition for 'rt'
setplot: no visible global function definition for 'par'
staircase.EM: no visible global function definition for 'var'
staircase.EM: no visible global function definition for 'dgamma'
Undefined global functions or variables:
  abline arrows colors dev.cur dev.off dev.set dgamma identify lines
  locator matlines nlm par points rnorm rt symbols text title var
Consider adding
  importFrom("grDevices", "colors", "dev.cur", "dev.off", "dev.set")
  importFrom("graphics", "abline", "arrows", "identify", "lines",
             "locator", "matlines", "par", "points", "symbols", "text",
             "title")
  importFrom("stats", "dgamma", "nlm", "rnorm", "rt", "var")
to your NAMESPACE file.