cvdglars: no visible global function definition for ‘model.response’
cvdglars: no visible global function definition for ‘is.empty.model’
cvdglars: no visible global function definition for ‘model.matrix’
cvdglars: no visible binding for global variable ‘contrasts’
cvdglars: no visible global function definition for ‘update’
cvdglars: no visible global function definition for ‘as.formula’
dglars: no visible global function definition for ‘model.response’
dglars: no visible global function definition for ‘is.empty.model’
dglars: no visible global function definition for ‘model.matrix’
dglars: no visible binding for global variable ‘contrasts’
gdf: no visible global function definition for ‘glm’
gdf: no visible global function definition for ‘binomial’
plot.cvdglars: no visible global function definition for ‘qt’
plot.cvdglars: no visible global function definition for ‘plot’
plot.cvdglars: no visible global function definition for ‘segments’
plot.cvdglars: no visible global function definition for ‘points’
plot.cvdglars: no visible global function definition for ‘abline’
plot.cvdglars: no visible global function definition for ‘axis’
plot.dglars: no visible global function definition for ‘plot’
plot.dglars: no visible global function definition for ‘abline’
plot.dglars: no visible global function definition for ‘points’
plot.dglars: no visible global function definition for ‘par’
plot.dglars: no visible global function definition for
  ‘dev.interactive’
plot.dglars: no visible global function definition for ‘matplot’
plot.dglars: no visible global function definition for ‘matpoints’
plot.dglars: no visible global function definition for ‘axis’
Undefined global functions or variables:
  abline as.formula axis binomial contrasts dev.interactive glm
  is.empty.model matplot matpoints model.matrix model.response par plot
  points qt segments update
Consider adding
  importFrom("grDevices", "dev.interactive")
  importFrom("graphics", "abline", "axis", "matplot", "matpoints", "par",
             "plot", "points", "segments")
  importFrom("stats", "as.formula", "binomial", "contrasts", "glm",
             "is.empty.model", "model.matrix", "model.response", "qt",
             "update")
to your NAMESPACE file.