DS: no visible global function definition for 'is.ts'
DS: no visible global function definition for 'ts'
DS: no visible global function definition for 'tsp<-'
DS: no visible global function definition for 'tsp'
KF: no visible global function definition for 'ts'
KF: no visible global function definition for 'tsp<-'
KF: no visible global function definition for 'tsp'
KF.deriv: no visible global function definition for 'ts'
KF.deriv: no visible global function definition for 'tsp<-'
KF.deriv: no visible global function definition for 'tsp'
KF.deriv.C: no visible global function definition for 'ts'
KF.deriv.C: no visible global function definition for 'tsp<-'
KF.deriv.C: no visible global function definition for 'tsp'
KS: no visible global function definition for 'is.ts'
KS: no visible global function definition for 'ts'
KS: no visible global function definition for 'tsp<-'
KS: no visible global function definition for 'tsp'
KS.deriv: no visible global function definition for 'ts'
KS.deriv: no visible global function definition for 'frequency'
KS.deriv: no visible global function definition for 'end'
KS.deriv: no visible global function definition for 'tsp<-'
KS.deriv: no visible global function definition for 'tsp'
KSDS: no visible global function definition for 'ts'
KSDS: no visible global function definition for 'frequency'
KSDS: no visible global function definition for 'end'
KSDS: no visible global function definition for 'tsp<-'
KSDS: no visible global function definition for 'tsp'
KSDS.deriv: no visible global function definition for 'ts'
KSDS.deriv: no visible global function definition for 'frequency'
KSDS.deriv: no visible global function definition for 'end'
KSDS.deriv: no visible global function definition for 'tsp<-'
KSDS.deriv: no visible global function definition for 'tsp'
KalmanFilter: no visible global function definition for 'ts'
KalmanFilter: no visible global function definition for 'tsp<-'
KalmanFilter: no visible global function definition for 'tsp'
predict.stsmSS: no visible global function definition for 'frequency'
predict.stsmSS: no visible global function definition for 'tsp'
predict.stsmSS: no visible global function definition for 'ts'
Undefined global functions or variables:
  end frequency is.ts ts tsp tsp<-
Consider adding
  importFrom("stats", "end", "frequency", "is.ts", "ts", "tsp", "tsp<-")
to your NAMESPACE file.