auc: no visible global function definition for ‘var’
auc.roc.plot: no visible global function definition for ‘par’
auc.roc.plot: no visible global function definition for ‘lines’
auc.roc.plot: no visible global function definition for ‘abline’
auc.roc.plot: no visible global function definition for ‘points’
auc.roc.plot: no visible global function definition for ‘text’
auc.roc.plot: no visible global function definition for ‘legend’
calibration.plot: no visible global function definition for ‘qf’
calibration.plot: no visible global function definition for ‘par’
calibration.plot: no visible global function definition for ‘abline’
calibration.plot: no visible global function definition for ‘lines’
calibration.plot: no visible global function definition for ‘points’
calibration.plot: no visible global function definition for ‘text’
error.threshold.plot: no visible global function definition for ‘par’
error.threshold.plot: no visible global function definition for ‘lines’
error.threshold.plot: no visible global function definition for
  ‘abline’
error.threshold.plot: no visible global function definition for
  ‘points’
error.threshold.plot: no visible global function definition for
  ‘legend’
presence.absence.hist: no visible global function definition for ‘hist’
presence.absence.hist: no visible global function definition for
  ‘barplot’
presence.absence.hist: no visible global function definition for ‘par’
presence.absence.hist: no visible global function definition for ‘text’
presence.absence.hist: no visible global function definition for
  ‘legend’
presence.absence.hist: no visible global function definition for
  ‘abline’
presence.absence.hist: no visible global function definition for
  ‘points’
presence.absence.simulation: no visible global function definition for
  ‘rbinom’
presence.absence.simulation: no visible global function definition for
  ‘rbeta’
presence.absence.summary: no visible global function definition for
  ‘par’
presence.absence.summary: no visible global function definition for
  ‘mtext’
Undefined global functions or variables:
  abline barplot hist legend lines mtext par points qf rbeta rbinom
  text var
Consider adding
  importFrom("graphics", "abline", "barplot", "hist", "legend", "lines",
             "mtext", "par", "points", "text")
  importFrom("stats", "qf", "rbeta", "rbinom", "var")
to your NAMESPACE file.