CVarea: no visible global function definition for ‘is’
EST: no visible global function definition for ‘coef’
aggr: no visible global function definition for ‘is’
bench: no visible global function definition for ‘is’
deff.weights: no visible global function definition for ‘var’
fSAE: no visible global function definition for ‘na.fail’
fSAE: no visible global function definition for ‘model.frame’
fSAE: no visible binding for global variable ‘na.fail’
fSAE: no visible global function definition for ‘model.response’
fSAE: no visible global function definition for ‘model.matrix’
fSAE.Unit: no visible global function definition for ‘is’
fSAE.Unit: no visible global function definition for ‘na.omit’
fSAE.Unit: no visible binding for global variable ‘var’
fSAE.Unit: no visible global function definition for ‘var’
fSAE.Unit: no visible global function definition for ‘optim’
fSAE.Unit: no visible global function definition for ‘optimize’
fSAE.Unit: no visible global function definition for ‘integrate’
fSAE.Unit: no visible global function definition for ‘curve’
fSAE.Unit: no visible global function definition for ‘abline’
fSAE.Unit: no visible global function definition for ‘mtext’
fSurvReg: no visible global function definition for ‘na.omit’
fitted.sae: no visible global function definition for ‘residuals’
generateFakeData: no visible global function definition for ‘rgamma’
generateFakeData: no visible global function definition for ‘rnorm’
generateFakeData: no visible global function definition for
  ‘model.matrix’
plot.sae: no visible global function definition for ‘dev.new’
plot.sae: no visible global function definition for ‘par’
plot.weights: no visible global function definition for ‘hist’
plot.weights: no visible global function definition for ‘boxplot’
print.sae: no visible global function definition for ‘coef’
print.sae: no visible global function definition for ‘vcov’
print.sae: no visible global function definition for ‘printCoefmat’
Undefined global functions or variables:
  abline boxplot coef curve dev.new hist integrate is model.frame
  model.matrix model.response mtext na.fail na.omit optim optimize par
  printCoefmat residuals rgamma rnorm var vcov
Consider adding
  importFrom("grDevices", "dev.new")
  importFrom("graphics", "abline", "boxplot", "curve", "hist", "mtext",
             "par")
  importFrom("methods", "is")
  importFrom("stats", "coef", "integrate", "model.frame", "model.matrix",
             "model.response", "na.fail", "na.omit", "optim", "optimize",
             "printCoefmat", "residuals", "rgamma", "rnorm", "var",
             "vcov")
to your NAMESPACE file (and ensure that your DESCRIPTION Imports field
contains 'methods').