Adjust.thin: no visible global function definition for 'ar.ols'
Auto.Q: no visible global function definition for 'acf'
Auto.Q: no visible global function definition for 'pchisq'
AutoBoot.test: no visible global function definition for 'rnorm'
AutoBoot.test: no visible global function definition for 'quantile'
Boot.test: no visible global function definition for 'rnorm'
Boot.test: no visible global function definition for 'runif'
Boot.test: no visible global function definition for 'quantile'
Chen.Deo: no visible global function definition for 'sd'
Chen.Deo: no visible global function definition for 'qchisq'
Chow.Denning: no visible global function definition for 'qnorm'
FastVR: no visible global function definition for 'acf'
Gen.Spec.Test: no visible global function definition for 'var'
Gen.Spec.Test: no visible global function definition for 'quantile'
JWright.crit: no visible global function definition for 'qnorm'
JWright.crit: no visible global function definition for 'rnorm'
JWright.crit: no visible global function definition for 'quantile'
LM_stat: no visible global function definition for 'filter'
Mammen: no visible global function definition for 'runif'
Rademacher: no visible global function definition for 'runif'
VR.minus.1: no visible global function definition for 'filter'
VR.plot: no visible global function definition for 'matplot'
VR.plot: no visible global function definition for 'abline'
VR.plot: no visible global function definition for 'grid'
VR.plot: no visible global function definition for 'title'
WK_stat1: no visible global function definition for 'filter'
Wald: no visible global function definition for 'qchisq'
Wald1: no visible global function definition for 'filter'
Wright.crit: no visible global function definition for 'qnorm'
Wright.crit: no visible global function definition for 'rnorm'
Wright.crit: no visible global function definition for 'quantile'
Wright_stat: no visible global function definition for 'qnorm'
stat.plot: no visible global function definition for 'filter'
Undefined global functions or variables:
  abline acf ar.ols filter grid matplot pchisq qchisq qnorm quantile
  rnorm runif sd title var
Consider adding
  importFrom("graphics", "abline", "grid", "matplot", "title")
  importFrom("stats", "acf", "ar.ols", "filter", "pchisq", "qchisq",
             "qnorm", "quantile", "rnorm", "runif", "sd", "var")
to your NAMESPACE file.