AmpSim: no visible global function definition for ‘sd’
AmpSim: no visible global function definition for ‘rnorm’
RGt: no visible global function definition for ‘na.omit’
RGt : <anonymous>: no visible global function definition for ‘lm’
amptester: no visible global function definition for ‘shapiro.test’
amptester : <anonymous>: no visible global function definition for ‘lm’
amptester : <anonymous>: no visible global function definition for
  ‘cor’
amptester : <anonymous>: no visible global function definition for
  ‘rstudent’
amptester: no visible global function definition for ‘na.omit’
amptester: no visible global function definition for ‘median’
amptester: no visible global function definition for ‘mad’
amptester: no visible global function definition for ‘rnorm’
amptester: no visible global function definition for ‘wilcox.test’
amptester: no visible global function definition for ‘head’
amptester: no visible global function definition for ‘tail’
amptester : pco: no visible global function definition for ‘predict’
amptester : pco: no visible global function definition for
  ‘smooth.spline’
amptester: no visible global function definition for ‘coef’
amptester: no visible global function definition for ‘lm’
lm.coefs : lm.fit : <anonymous>: no visible global function definition
  for ‘lm’
normalizer : <anonymous>: no visible global function definition for
  ‘quantile’
normalizer : <anonymous>: no visible global function definition for
  ‘sd’
plotCurves: no visible global function definition for ‘matplot’
plotCurves: no visible global function definition for ‘par’
plotCurves: no visible global function definition for ‘layout’
plotCurves : <anonymous>: no visible global function definition for
  ‘rect’
plotCurves : <anonymous>: no visible global function definition for
  ‘par’
plotCurves : <anonymous>: no visible global function definition for
  ‘text’
plotCurves : <anonymous>: no visible global function definition for
  ‘rug’
plotCurves : <anonymous>: no visible global function definition for
  ‘axis’
plotCurves : <anonymous>: no visible global function definition for
  ‘lines’
rtg.test : <anonymous>: no visible global function definition for ‘lm’
rtg.test : <anonymous>: no visible global function definition for ‘cor’
rtg.test : <anonymous>: no visible global function definition for
  ‘rstudent’
th.cyc: no visible global function definition for ‘quantile’
th.cyc: no visible global function definition for ‘mad’
th.est: no visible global function definition for ‘tail’
th.est: no visible global function definition for ‘head’
th.est: no visible global function definition for ‘lm’
plot,amptest-ANY: no visible global function definition for ‘head’
plot,amptest-ANY: no visible global function definition for ‘tail’
plot,amptest-ANY: no visible global function definition for ‘median’
plot,amptest-ANY: no visible global function definition for ‘mad’
plot,amptest-ANY: no visible global function definition for
  ‘shapiro.test’
plot,amptest-ANY: no visible global function definition for
  ‘wilcox.test’
plot,amptest-ANY: no visible global function definition for ‘layout’
plot,amptest-ANY: no visible global function definition for ‘abline’
plot,amptest-ANY: no visible global function definition for ‘text’
plot,amptest-ANY: no visible global function definition for ‘arrows’
plot,amptest-ANY: no visible global function definition for ‘mtext’
plot,amptest-ANY: no visible global function definition for ‘axis’
plot,bg-ANY: no visible global function definition for ‘abline’
plot,bg-ANY: no visible global function definition for ‘text’
plot,der-ANY: no visible global function definition for ‘points’
plot,eff-ANY: no visible global function definition for ‘predict.lm’
plot,eff-ANY: no visible global function definition for ‘polygon’
plot,eff-ANY: no visible global function definition for ‘adjustcolor’
plot,eff-ANY: no visible global function definition for ‘arrows’
plot,eff-ANY: no visible global function definition for ‘abline’
plot,eff-ANY: no visible global function definition for ‘legend’
plot,refMFI-ANY: no visible global function definition for ‘par’
plot,refMFI-ANY: no visible global function definition for ‘layout’
plot,refMFI-ANY: no visible global function definition for ‘arrows’
plot,refMFI-ANY: no visible global function definition for ‘mtext’
plot,refMFI-ANY: no visible global function definition for ‘abline’
plot,refMFI-refMFI: no visible global function definition for ‘par’
plot,refMFI-refMFI: no visible global function definition for ‘layout’
plot,refMFI-refMFI: no visible global function definition for ‘points’
plot,refMFI-refMFI: no visible global function definition for
  ‘adjustcolor’
plot,refMFI-refMFI: no visible global function definition for ‘arrows’
plot,refMFI-refMFI: no visible global function definition for ‘mtext’
plot,refMFI-refMFI: no visible global function definition for ‘abline’
plot,refMFI-refMFI: no visible global function definition for ‘legend’
plot,refMFI-refMFI: no visible global function definition for ‘lines’
qqline,refMFI: no visible binding for global variable ‘qnorm’
Undefined global functions or variables:
  abline adjustcolor arrows axis coef cor head layout legend lines lm
  mad matplot median mtext na.omit par points polygon predict
  predict.lm qnorm quantile rect rnorm rstudent rug sd shapiro.test
  smooth.spline tail text wilcox.test
Consider adding
  importFrom("grDevices", "adjustcolor")
  importFrom("graphics", "abline", "arrows", "axis", "layout", "legend",
             "lines", "matplot", "mtext", "par", "points", "polygon",
             "rect", "rug", "text")
  importFrom("stats", "coef", "cor", "lm", "mad", "median", "na.omit",
             "predict", "predict.lm", "qnorm", "quantile", "rnorm",
             "rstudent", "sd", "shapiro.test", "smooth.spline",
             "wilcox.test")
  importFrom("utils", "head", "tail")
to your NAMESPACE file.