add.test: no visible global function definition for ‘ace’
add.test: no visible global function definition for ‘lm’
add.test: no visible global function definition for ‘pchisq’
contingency.periodogram: no visible global function definition for
  ‘fisher.test’
contingency.periodogram: no visible global function definition for
  ‘chisq.test’
lin.order.cls: no visible global function definition for ‘var’
lin.test: no visible global function definition for ‘residuals’
lin.test: no visible global function definition for ‘lm’
lin.test: no visible global function definition for ‘pf’
ll.order: no visible global function definition for ‘var’
ll.order: no visible global function definition for ‘locfit.raw’
ll.order: no visible global function definition for ‘dat’
plot.contingency.periodogram: no visible global function definition for
  ‘plot’
plot.contingency.periodogram: no visible global function definition for
  ‘lines’
plot.contingency.periodogram: no visible global function definition for
  ‘qchisq’
plot.lin.order: no visible global function definition for ‘plot’
plot.ll.order: no visible global function definition for ‘plot’
plot.lomb: no visible global function definition for ‘plot’
plot.ppll: no visible global function definition for ‘plot’
plot.specar.ci: no visible global function definition for ‘plot’
plot.specar.ci: no visible global function definition for ‘lines’
portman.Q: no visible global function definition for ‘acf’
portman.Q: no visible global function definition for ‘pchisq’
predict.ll.order: no visible global function definition for ‘var’
predict.ll.order: no visible global function definition for
  ‘locfit.raw’
predict.ll.order: no visible global function definition for ‘predict’
spec.lomb: no visible global function definition for ‘var’
specar.ci: no visible global function definition for ‘ar’
specar.ci: no visible global function definition for ‘ar.mle’
specar.ci: no visible global function definition for ‘spec.ar’
specar.ci: no visible global function definition for ‘rnorm’
specar.ci: no visible binding for global variable ‘quantile’
summary.specar.ci: no visible global function definition for ‘quantile’
Undefined global functions or variables:
  ace acf ar ar.mle chisq.test dat fisher.test lines lm locfit.raw
  pchisq pf plot predict qchisq quantile residuals rnorm spec.ar var
Consider adding
  importFrom("graphics", "lines", "plot")
  importFrom("stats", "acf", "ar", "ar.mle", "chisq.test", "fisher.test",
             "lm", "pchisq", "pf", "predict", "qchisq", "quantile",
             "residuals", "rnorm", "spec.ar", "var")
to your NAMESPACE file.