fwdglm: no visible global function definition for 'is.empty.model'
fwdglm: no visible global function definition for 'model.matrix'
fwdglm: no visible global function definition for 'model.response'
fwdglm: no visible global function definition for 'model.weights'
fwdglm: no visible global function definition for 'model.offset'
fwdglm: no visible global function definition for 'glm.fit'
fwdglm: no visible global function definition for 'glm.control'
fwdlm: no visible global function definition for 'model.response'
fwdlm: no visible global function definition for 'model.matrix'
fwdlm: no visible global function definition for 'lm.fit'
fwdsco: no visible global function definition for 'model.response'
fwdsco: no visible global function definition for 'model.matrix'
fwdsco: no visible global function definition for 'lm.fit'
lmsglm : subset.median: no visible global function definition for
  'glm.fit'
lmsglm : subset.median: no visible global function definition for
  'glm.control'
lmsglm : subset.median: no visible global function definition for
  'median'
lmsglm: no visible global function definition for 'na.omit'
lmsglm: no visible global function definition for 'glm.fit'
lmsglm: no visible global function definition for 'glm.control'
plot.fwdglm: no visible global function definition for 'par'
plot.fwdglm: no visible global function definition for 'plot'
plot.fwdglm: no visible global function definition for 'lines'
plot.fwdglm: no visible global function definition for 'text'
plot.fwdglm: no visible global function definition for 'points'
plot.fwdglm : <anonymous>: no visible global function definition for
  'na.omit'
plot.fwdglm: no visible global function definition for 'legend'
plot.fwdglm: no visible global function definition for 'abline'
plot.fwdglm: no visible global function definition for 'axis'
plot.fwdlm: no visible global function definition for 'par'
plot.fwdlm: no visible global function definition for 'plot'
plot.fwdlm: no visible global function definition for 'lines'
plot.fwdlm: no visible global function definition for 'text'
plot.fwdlm: no visible global function definition for 'points'
plot.fwdlm: no visible global function definition for 'na.omit'
plot.fwdlm: no visible global function definition for 'abline'
plot.fwdsco: no visible global function definition for 'par'
plot.fwdsco: no visible global function definition for 'plot'
plot.fwdsco: no visible global function definition for 'lines'
plot.fwdsco: no visible global function definition for 'text'
plot.fwdsco: no visible global function definition for 'abline'
plot.fwdsco: no visible global function definition for 'points'
Undefined global functions or variables:
  abline axis glm.control glm.fit is.empty.model legend lines lm.fit
  median model.matrix model.offset model.response model.weights na.omit
  par plot points text
Consider adding
  importFrom("graphics", "abline", "axis", "legend", "lines", "par",
             "plot", "points", "text")
  importFrom("stats", "glm.control", "glm.fit", "is.empty.model",
             "lm.fit", "median", "model.matrix", "model.offset",
             "model.response", "model.weights", "na.omit")
to your NAMESPACE file.