RMA: no visible global function definition for ‘sd’
foldsComposition: no visible global function definition for ‘runif’
formulaAm: no visible global function definition for ‘as.formula’
formulaLm: no visible global function definition for ‘as.formula’
modelComparison: no visible global function definition for ‘par’
modelComparison: no visible global function definition for ‘dotchart’
modelComparison: no visible global function definition for ‘axis’
modelComparison: no visible global function definition for ‘abline’
modelComparison: no visible global function definition for ‘axTicks’
modelFit: no visible global function definition for ‘as.formula’
modelFit: no visible global function definition for ‘lm’
modelFit: no visible global function definition for ‘step’
penaltyPolyMARS: no visible global function definition for ‘par’
penaltyPolyMARS: no visible global function definition for ‘axis’
penaltyPolyMARS: no visible global function definition for ‘mtext’
residualsStudy: no visible global function definition for ‘par’
residualsStudy: no visible global function definition for ‘hist’
residualsStudy: no visible global function definition for ‘density’
residualsStudy: no visible global function definition for ‘lines’
residualsStudy: no visible global function definition for ‘title’
stepEvolution: no visible global function definition for ‘polygon’
stepEvolution: no visible global function definition for ‘text’
stepEvolution: no visible global function definition for ‘par’
stepEvolution: no visible global function definition for ‘axis’
stepEvolution: no visible global function definition for ‘mtext’
testCrossValidation: no visible global function definition for ‘par’
Undefined global functions or variables:
  abline as.formula axTicks axis density dotchart hist lines lm mtext
  par polygon runif sd step text title
Consider adding
  importFrom("graphics", "abline", "axTicks", "axis", "dotchart", "hist",
             "lines", "mtext", "par", "polygon", "text", "title")
  importFrom("stats", "as.formula", "density", "lm", "runif", "sd",
             "step")
to your NAMESPACE file.