best.arima: no visible global function definition for ‘is.ts’
best.arima: no visible global function definition for ‘frequency’
best.arima: no visible global function definition for ‘arima’
np.ancova: no visible binding for global variable ‘var’
np.ancova: no visible global function definition for ‘pnorm’
np.cv: no visible global function definition for ‘quantile’
np.gcv: no visible global function definition for ‘quantile’
np.gof: no visible global function definition for ‘var’
np.gof: no visible global function definition for ‘pnorm’
par.ancova: no visible global function definition for ‘var’
par.ancova: no visible global function definition for ‘pchisq’
par.ci: no visible global function definition for ‘arima’
par.ci: no visible global function definition for ‘Box.test’
par.ci: no visible global function definition for ‘residuals’
par.ci: no visible global function definition for ‘t.test’
par.ci: no visible global function definition for ‘qnorm’
par.ci: no visible global function definition for ‘ARMAtoMA’
par.ci: no visible global function definition for ‘quantile’
par.gof: no visible global function definition for ‘var’
par.gof: no visible global function definition for ‘pchisq’
plrm.ancova: no visible global function definition for ‘var’
plrm.ancova: no visible binding for global variable ‘var’
plrm.ci: no visible global function definition for ‘arima’
plrm.ci: no visible global function definition for ‘Box.test’
plrm.ci: no visible global function definition for ‘residuals’
plrm.ci: no visible global function definition for ‘t.test’
plrm.ci: no visible global function definition for ‘qnorm’
plrm.ci: no visible global function definition for ‘ARMAtoMA’
plrm.ci: no visible global function definition for ‘quantile’
plrm.cv: no visible global function definition for ‘quantile’
plrm.gcv: no visible global function definition for ‘quantile’
plrm.gof: no visible global function definition for ‘var’
var.cov.matrix: no visible global function definition for ‘arima’
var.cov.matrix: no visible global function definition for ‘Box.test’
var.cov.matrix: no visible global function definition for ‘residuals’
var.cov.matrix: no visible global function definition for ‘t.test’
var.cov.matrix: no visible global function definition for ‘toeplitz’
var.cov.matrix: no visible global function definition for ‘ARMAacf’
var.cov.matrix: no visible global function definition for ‘var’
var.cov.sum: no visible global function definition for ‘arima’
var.cov.sum: no visible global function definition for ‘Box.test’
var.cov.sum: no visible global function definition for ‘residuals’
var.cov.sum: no visible global function definition for ‘t.test’
var.cov.sum: no visible global function definition for ‘ARMAacf’
var.cov.sum: no visible global function definition for ‘var’
Undefined global functions or variables:
  ARMAacf ARMAtoMA Box.test arima frequency is.ts pchisq pnorm qnorm
  quantile residuals t.test toeplitz var
Consider adding
  importFrom("stats", "ARMAacf", "ARMAtoMA", "Box.test", "arima",
             "frequency", "is.ts", "pchisq", "pnorm", "qnorm",
             "quantile", "residuals", "t.test", "toeplitz", "var")
to your NAMESPACE file.