AsyPwrGSD: no visible global function definition for 'approx'
CY2TOShaz: no visible global function definition for 'optim'
CondPower: no visible global function definition for 'qnorm'
CondPower: no visible global function definition for 'pnorm'
EX1gXK: no visible global function definition for 'approx'
Elements: no visible binding for global variable 'na.pass'
IntSurvDiff: no visible global function definition for 'is.empty.model'
IntSurvDiff: no visible global function definition for 'model.matrix'
IntSurvDiff: no visible global function definition for 'model.extract'
RCM2RR: no visible global function definition for 'optimize'
SimGSB.boundaries: no visible global function definition for 'rnorm'
SimPwrGSD: no visible binding for global variable 'var'
as.boundaries.PwrGSD: no visible global function definition for
  'update'
costopplot: no visible global function definition for 'par'
costopplot: no visible global function definition for 'gray'
costopplot: no visible global function definition for 'model.frame'
costopplot: no visible global function definition for 'model.extract'
costopplot: no visible global function definition for 'co.intervals'
costopplot: no visible global function definition for 'plot.new'
costopplot : do.panel : Paxis: no visible global function definition
  for 'axis'
costopplot : do.panel: no visible global function definition for 'par'
costopplot : do.panel: no visible global function definition for
  'plot.new'
costopplot : do.panel: no visible global function definition for
  'plot.window'
costopplot : do.panel: no visible global function definition for 'grid'
costopplot : do.panel: no visible global function definition for 'box'
costopplot: no visible global function definition for 'mtext'
costopplot: no visible global function definition for 'plot.window'
costopplot: no visible global function definition for 'rect'
costopplot: no visible global function definition for 'text'
costopplot: no visible global function definition for 'axis'
costopplot: no visible global function definition for 'box'
mysurvfit: no visible binding for global variable 'na.fail'
mysurvfit: no visible global function definition for 'model.extract'
plot.blkdcp: no visible global function definition for 'quantile'
plot.blkdcp: no visible global function definition for 'plot'
plot.blkdcp: no visible global function definition for 'lines'
plot.boundaries: no visible global function definition for 'col2rgb'
plot.boundaries: no visible global function definition for 'points'
print.survtest: no visible global function definition for 'pnorm'
stpplt: no visible global function definition for 'polygon'
summary.survtest: no visible global function definition for 'pnorm'
wtdlogrank: no visible global function definition for 'is.empty.model'
wtdlogrank: no visible global function definition for 'model.matrix'
wtdlogrank: no visible global function definition for 'model.extract'
Undefined global functions or variables:
  approx axis box co.intervals col2rgb gray grid is.empty.model lines
  model.extract model.frame model.matrix mtext na.fail na.pass optim
  optimize par plot plot.new plot.window pnorm points polygon qnorm
  quantile rect rnorm text update var
Consider adding
  importFrom("grDevices", "col2rgb", "gray")
  importFrom("graphics", "axis", "box", "co.intervals", "grid", "lines",
             "mtext", "par", "plot", "plot.new", "plot.window", "points",
             "polygon", "rect", "text")
  importFrom("stats", "approx", "is.empty.model", "model.extract",
             "model.frame", "model.matrix", "na.fail", "na.pass",
             "optim", "optimize", "pnorm", "qnorm", "quantile", "rnorm",
             "update", "var")
to your NAMESPACE file.