LogLikCIR: no visible global function definition for ‘head’
LogLikCIR: no visible global function definition for ‘dchisq’
LogLikFeller: no visible global function definition for ‘head’
LogLikFeller: no visible global function definition for ‘dchisq’
LogLikOU: no visible global function definition for ‘head’
LogLikVasicek: no visible global function definition for ‘head’
bond.cir: no visible global function definition for ‘melt’
bond.cir: no visible global function definition for ‘ggplot’
bond.cir: no visible global function definition for ‘aes’
bond.cir: no visible global function definition for ‘geom_line’
bond.cir: no visible global function definition for ‘ggtitle’
bond.vasicek: no visible global function definition for ‘melt’
bond.vasicek: no visible global function definition for ‘ggplot’
bond.vasicek: no visible global function definition for ‘aes’
bond.vasicek: no visible global function definition for ‘geom_line’
bond.vasicek: no visible global function definition for ‘ggtitle’
est.cir: no visible global function definition for ‘acf’
est.cir: no visible global function definition for ‘sd’
est.cir: no visible global function definition for ‘plot’
est.cir: no visible global function definition for ‘title’
est.cir: no visible global function definition for ‘optim’
est.cir: no visible global function definition for ‘melt’
est.cir: no visible global function definition for ‘ggplot’
est.cir: no visible global function definition for ‘aes’
est.cir: no visible global function definition for ‘geom_line’
est.cir: no visible global function definition for ‘ggtitle’
est.cir: no visible global function definition for ‘cov’
est.cir: no visible global function definition for ‘pseudoinverse’
est.cir: no visible global function definition for ‘qnorm’
est.feller: no visible global function definition for ‘acf’
est.feller: no visible global function definition for ‘sd’
est.feller: no visible global function definition for ‘optim’
est.feller: no visible global function definition for ‘cov’
est.feller: no visible global function definition for ‘pseudoinverse’
est.feller: no visible global function definition for ‘qnorm’
est.ou: no visible global function definition for ‘optim’
est.ou: no visible global function definition for ‘cov’
est.ou: no visible global function definition for ‘pseudoinverse’
est.ou: no visible global function definition for ‘qnorm’
est.ou: no visible global function definition for ‘head’
est.ou: no visible global function definition for ‘sd’
est.ou: no visible global function definition for ‘cor’
est.vasicek: no visible global function definition for ‘acf’
est.vasicek: no visible global function definition for ‘sd’
est.vasicek: no visible global function definition for ‘plot’
est.vasicek: no visible global function definition for ‘title’
est.vasicek: no visible global function definition for ‘optim’
est.vasicek: no visible global function definition for ‘melt’
est.vasicek: no visible global function definition for ‘ggplot’
est.vasicek: no visible global function definition for ‘aes’
est.vasicek: no visible global function definition for ‘geom_line’
est.vasicek: no visible global function definition for ‘ggtitle’
est.vasicek: no visible global function definition for ‘cov’
est.vasicek: no visible global function definition for ‘pseudoinverse’
est.vasicek: no visible global function definition for ‘qnorm’
sim.cir: no visible global function definition for ‘melt’
sim.cir: no visible global function definition for ‘ggplot’
sim.cir: no visible global function definition for ‘aes’
sim.cir: no visible global function definition for ‘geom_line’
sim.cir: no visible global function definition for ‘ggtitle’
sim.n.chi2: no visible global function definition for ‘rchisq’
sim.n.chi2: no visible global function definition for ‘rnorm’
sim.n.chi2: no visible global function definition for ‘rpois’
sim.vasicek: no visible global function definition for ‘rnorm’
sim.vasicek: no visible global function definition for ‘melt’
sim.vasicek: no visible global function definition for ‘ggplot’
sim.vasicek: no visible global function definition for ‘aes’
sim.vasicek: no visible global function definition for ‘geom_line’
sim.vasicek: no visible global function definition for ‘ggtitle’
Undefined global functions or variables:
  acf aes cor cov dchisq geom_line ggplot ggtitle head melt optim plot
  pseudoinverse qnorm rchisq rnorm rpois sd title
Consider adding
  importFrom("graphics", "plot", "title")
  importFrom("stats", "acf", "cor", "cov", "dchisq", "optim", "qnorm",
             "rchisq", "rnorm", "rpois", "sd")
  importFrom("utils", "head")
to your NAMESPACE file.