BBQ: no visible global function definition for 'is.ts'
BCDating.alter2: no visible global function definition for 'start'
BCDating.alter2: no visible global function definition for 'end'
BCDating.alter2: no visible global function definition for 'frequency'
BCDating.censor: no visible global function definition for 'frequency'
BCDating.init: no visible global function definition for 'is.ts'
BCDating.init: no visible global function definition for 'start'
BCDating.init: no visible global function definition for 'end'
BCDating.init: no visible global function definition for 'frequency'
BCDating.peakstroughs: no visible global function definition for 'ts'
BCDating.peakstroughs: no visible global function definition for 'time'
BCDating.pt2states: no visible global function definition for 'ts'
avgts: no visible global function definition for 'na.omit'
avgts: no visible global function definition for 'start'
avgts: no visible global function definition for 'end'
avgts: no visible global function definition for 'frequency'
sid: no visible global function definition for 'start'
sid: no visible global function definition for 'frequency'
ts2char: no visible global function definition for 'is.ts'
ts2char: no visible global function definition for 'time'
ts2char: no visible global function definition for 'cycle'
ts2char: no visible global function definition for 'frequency'
vrt: no visible global function definition for 'time'
vrt: no visible global function definition for 'ts'
vrt: no visible global function definition for 'frequency'
plot,BCDating-missing: no visible global function definition for 'grey'
plot,BCDating-missing: no visible global function definition for 'time'
plot,BCDating-missing: no visible global function definition for
  'frequency'
plot,BCDating-missing: no visible global function definition for 'ts'
plot,BCDating-missing: no visible global function definition for
  'deltat'
plot,BCDating-missing: no visible global function definition for 'rect'
plot,BCDating-missing: no visible global function definition for
  'title'
plot,BCDating-missing: no visible global function definition for
  'cycle'
plot,BCDating-missing: no visible global function definition for 'text'
plot,BCDating-missing: no visible global function definition for
  'lines'
plot,BCDating-missing: no visible global function definition for
  'segments'
plot,BCDating-missing: no visible global function definition for 'box'
plot,BCDating-ts: no visible global function definition for 'grey'
plot,BCDating-ts: no visible global function definition for 'time'
plot,BCDating-ts: no visible global function definition for 'frequency'
plot,BCDating-ts: no visible global function definition for 'ts'
plot,BCDating-ts: no visible global function definition for 'tsp'
plot,BCDating-ts: no visible binding for global variable 'na.rm'
plot,BCDating-ts: no visible global function definition for 'lines'
plot,BCDating-ts: no visible global function definition for 'segments'
plot,BCDating-ts: no visible global function definition for 'box'
plot,list-missing: no visible global function definition for 'time'
plot,list-missing: no visible global function definition for 'par'
plot,list-missing: no visible global function definition for 'grey'
plot,list-missing: no visible global function definition for 'deltat'
plot,list-missing: no visible global function definition for 'rect'
plot,list-missing: no visible global function definition for 'cycle'
plot,list-missing: no visible global function definition for 'text'
Undefined global functions or variables:
  box cycle deltat end frequency grey is.ts lines na.omit na.rm par
  rect segments start text time title ts tsp
Consider adding
  importFrom("grDevices", "grey")
  importFrom("graphics", "box", "lines", "par", "rect", "segments",
             "text", "title")
  importFrom("stats", "cycle", "deltat", "end", "frequency", "is.ts",
             "na.omit", "start", "time", "ts", "tsp")
to your NAMESPACE file.