plot.SPRT: no visible global function definition for 'par'
plot.SPRT: no visible global function definition for 'abline'
print.SPRT: no visible global function definition for 'head'
Undefined global functions or variables:
  abline head par
Consider adding
  importFrom("graphics", "abline", "par")
  importFrom("utils", "head")
to your NAMESPACE file.
plot.SPRT: no visible global function definition for ‘par’
plot.SPRT: no visible global function definition for ‘abline’
print.SPRT: no visible global function definition for ‘head’
Undefined global functions or variables:
  abline head par
Consider adding
  importFrom("graphics", "abline", "par")
  importFrom("utils", "head")
to your NAMESPACE file.
plot.SPRT: no visible global function definition for ‘par’
plot.SPRT: no visible global function definition for ‘abline’
print.SPRT: no visible global function definition for ‘head’
Undefined global functions or variables:
  abline head par
Consider adding
  importFrom("graphics", "abline", "par")
  importFrom("utils", "head")
to your NAMESPACE file.
plot.SPRT: no visible global function definition for ‘par’
plot.SPRT: no visible global function definition for ‘abline’
print.SPRT: no visible global function definition for ‘head’
Undefined global functions or variables:
  abline head par
Consider adding
  importFrom("graphics", "abline", "par")
  importFrom("utils", "head")
to your NAMESPACE file.
plot.SPRT: no visible global function definition for 'par'
plot.SPRT: no visible global function definition for 'abline'
print.SPRT: no visible global function definition for 'head'
Undefined global functions or variables:
  abline head par
Consider adding
  importFrom("graphics", "abline", "par")
  importFrom("utils", "head")
to your NAMESPACE file.
plot.SPRT: no visible global function definition for ‘par’
plot.SPRT: no visible global function definition for ‘abline’
print.SPRT: no visible global function definition for ‘head’
Undefined global functions or variables:
  abline head par
Consider adding
  importFrom("graphics", "abline", "par")
  importFrom("utils", "head")
to your NAMESPACE file.
plot.SPRT: no visible global function definition for ‘par’
plot.SPRT: no visible global function definition for ‘abline’
print.SPRT: no visible global function definition for ‘head’
Undefined global functions or variables:
  abline head par
Consider adding
  importFrom("graphics", "abline", "par")
  importFrom("utils", "head")
to your NAMESPACE file.
plot.SPRT: no visible global function definition for ‘par’
plot.SPRT: no visible global function definition for ‘abline’
print.SPRT: no visible global function definition for ‘head’
Undefined global functions or variables:
  abline head par
Consider adding
  importFrom("graphics", "abline", "par")
  importFrom("utils", "head")
to your NAMESPACE file.
plot.SPRT: no visible global function definition for ‘par’
plot.SPRT: no visible global function definition for ‘abline’
print.SPRT: no visible global function definition for ‘head’
Undefined global functions or variables:
  abline head par
Consider adding
  importFrom("graphics", "abline", "par")
  importFrom("utils", "head")
to your NAMESPACE file.
plot.SPRT: no visible global function definition for 'par'
plot.SPRT: no visible global function definition for 'abline'
print.SPRT: no visible global function definition for 'head'
Undefined global functions or variables:
  abline head par
Consider adding
  importFrom("graphics", "abline", "par")
  importFrom("utils", "head")
to your NAMESPACE file.
plot.SPRT: no visible global function definition for ‘par’
plot.SPRT: no visible global function definition for ‘abline’
print.SPRT: no visible global function definition for ‘head’
Undefined global functions or variables:
  abline head par
Consider adding
  importFrom("graphics", "abline", "par")
  importFrom("utils", "head")
to your NAMESPACE file.
plot.SPRT: no visible global function definition for ‘par’
plot.SPRT: no visible global function definition for ‘abline’
print.SPRT: no visible global function definition for ‘head’
Undefined global functions or variables:
  abline head par
Consider adding
  importFrom("graphics", "abline", "par")
  importFrom("utils", "head")
to your NAMESPACE file.
plot.SPRT: no visible global function definition for 'par'
plot.SPRT: no visible global function definition for 'abline'
print.SPRT: no visible global function definition for 'head'
Undefined global functions or variables:
  abline head par
Consider adding
  importFrom("graphics", "abline", "par")
  importFrom("utils", "head")
to your NAMESPACE file.