estimate.rho.par: no visible global function definition for ‘var’
estimate.sigma.par: no visible global function definition for ‘sd’
estimate.sigma.par: no visible global function definition for ‘var’
fit.par: no visible global function definition for ‘sd’
fit.par.both: no visible global function definition for ‘sd’
fit.par.both: no visible global function definition for ‘median’
fit.par.both: no visible global function definition for ‘optim’
fit.par.both: no visible global function definition for ‘nlm’
fit.par.mr: no visible global function definition for ‘sd’
fit.par.mr: no visible global function definition for ‘median’
fit.par.mr: no visible global function definition for ‘optim’
fit.par.rw: no visible global function definition for ‘sd’
fit.par.rw: no visible global function definition for ‘optimize’
par.find.joint.critical.values : find1: no visible global function
  definition for ‘quantile’
par.find.joint.critical.values : find1: no visible global function
  definition for ‘optim’
par.generate.likelihood_ratio.samples: no visible global function
  definition for ‘write.table’
par.load.likelihood_ratio.samples : <anonymous>: no visible global
  function definition for ‘read.table’
par.plot.lrt.vs.kpss: no visible global function definition for
  ‘read.table’
par.plot.power: no visible global function definition for ‘read.table’
par.plot.power.pvmr: no visible global function definition for
  ‘read.table’
par.powersamples.pvmr.table: no visible global function definition for
  ‘write.table’
par.powersamples.table: no visible global function definition for
  ‘write.table’
par.rho.cutoff: no visible global function definition for ‘approx’
plot.internal.par.fit: no visible global function definition for ‘sd’
plot.par.likelihood.neighborhood: no visible global function definition
  for ‘is’
plot.par.likelihood.neighborhood: no visible global function definition
  for ‘sd’
plot.par.likelihood.neighborhood.3d: no visible global function
  definition for ‘is’
plot.par.likelihood.neighborhood.3d: no visible global function
  definition for ‘sd’
print.par.lrt.quantile_quadrants: no visible global function definition
  for ‘qchisq’
quantile.table.from.samples: no visible global function definition for
  ‘quantile’
quantile_table_interpolate: no visible global function definition for
  ‘approx’
rpar: no visible global function definition for ‘rnorm’
rpar: no visible global function definition for ‘rt’
test.par: no visible global function definition for ‘is’
which.hypothesis.partest: no visible global function definition for
  ‘is’
Undefined global functions or variables:
  approx is median nlm optim optimize qchisq quantile read.table rnorm
  rt sd var write.table
Consider adding
  importFrom("methods", "is")
  importFrom("stats", "approx", "median", "nlm", "optim", "optimize",
             "qchisq", "quantile", "rnorm", "rt", "sd", "var")
  importFrom("utils", "read.table", "write.table")
to your NAMESPACE file (and ensure that your DESCRIPTION Imports field
contains 'methods').