File
  LICENSE
is not mentioned in the DESCRIPTION file.
dummy: no visible global function definition for 'model.matrix'
dummy: no visible global function definition for 'model.frame'
Undefined global functions or variables:
  model.frame model.matrix
Consider adding
  importFrom("stats", "model.frame", "model.matrix")
to your NAMESPACE file.
Rd file 'dummy.Rd':
  \usage lines wider than 90 characters:
     dummy.data.frame(data, names = NULL, omit.constants=TRUE, dummy.classes = getOption("dummy.classes"), all = TRUE, ...)

These lines will be truncated in the PDF manual.
dummy: no visible global function definition for ‘model.matrix’
dummy: no visible global function definition for ‘model.frame’
Undefined global functions or variables:
  model.frame model.matrix
Consider adding
  importFrom("stats", "model.frame", "model.matrix")
to your NAMESPACE file.