crrstep : crr.makecov1: no visible global function definition for
  'model.matrix'
crrstep : crr.dropterm: no visible global function definition for
  'terms'
crrstep : crr.dropterm: no visible global function definition for
  'as.formula'
crrstep : crr.addterm: no visible global function definition for
  'terms'
crrstep : crr.addterm: no visible global function definition for
  'as.formula'
crrstep: no visible global function definition for 'as.formula'
crrstep: no visible global function definition for 'terms'
crrstep: no visible global function definition for 'model.frame'
crrstep: no visible binding for global variable 'na.pass'
crrstep: no visible global function definition for 'update'
crrstep: no visible global function definition for 'drop.terms'
Undefined global functions or variables:
  as.formula drop.terms model.frame model.matrix na.pass terms update
Consider adding
  importFrom("stats", "as.formula", "drop.terms", "model.frame",
             "model.matrix", "na.pass", "terms", "update")
to your NAMESPACE file.
crrstep : crr.makecov1: no visible global function definition for
  ‘model.matrix’
crrstep : crr.dropterm: no visible global function definition for
  ‘terms’
crrstep : crr.dropterm: no visible global function definition for
  ‘as.formula’
crrstep : crr.addterm: no visible global function definition for
  ‘terms’
crrstep : crr.addterm: no visible global function definition for
  ‘as.formula’
crrstep: no visible global function definition for ‘as.formula’
crrstep: no visible global function definition for ‘terms’
crrstep: no visible global function definition for ‘model.frame’
crrstep: no visible binding for global variable ‘na.pass’
crrstep: no visible global function definition for ‘update’
crrstep: no visible global function definition for ‘drop.terms’
Undefined global functions or variables:
  as.formula drop.terms model.frame model.matrix na.pass terms update
Consider adding
  importFrom("stats", "as.formula", "drop.terms", "model.frame",
             "model.matrix", "na.pass", "terms", "update")
to your NAMESPACE file.
crrstep : crr.makecov1: no visible global function definition for
  ‘model.matrix’
crrstep : crr.dropterm: no visible global function definition for
  ‘terms’
crrstep : crr.dropterm: no visible global function definition for
  ‘as.formula’
crrstep : crr.addterm: no visible global function definition for
  ‘terms’
crrstep : crr.addterm: no visible global function definition for
  ‘as.formula’
crrstep: no visible global function definition for ‘as.formula’
crrstep: no visible global function definition for ‘terms’
crrstep: no visible global function definition for ‘model.frame’
crrstep: no visible binding for global variable ‘na.pass’
crrstep: no visible global function definition for ‘update’
crrstep: no visible global function definition for ‘drop.terms’
Undefined global functions or variables:
  as.formula drop.terms model.frame model.matrix na.pass terms update
Consider adding
  importFrom("stats", "as.formula", "drop.terms", "model.frame",
             "model.matrix", "na.pass", "terms", "update")
to your NAMESPACE file.
crrstep : crr.makecov1: no visible global function definition for
  ‘model.matrix’
crrstep : crr.dropterm: no visible global function definition for
  ‘terms’
crrstep : crr.dropterm: no visible global function definition for
  ‘as.formula’
crrstep : crr.addterm: no visible global function definition for
  ‘terms’
crrstep : crr.addterm: no visible global function definition for
  ‘as.formula’
crrstep: no visible global function definition for ‘as.formula’
crrstep: no visible global function definition for ‘terms’
crrstep: no visible global function definition for ‘model.frame’
crrstep: no visible binding for global variable ‘na.pass’
crrstep: no visible global function definition for ‘update’
crrstep: no visible global function definition for ‘drop.terms’
Undefined global functions or variables:
  as.formula drop.terms model.frame model.matrix na.pass terms update
Consider adding
  importFrom("stats", "as.formula", "drop.terms", "model.frame",
             "model.matrix", "na.pass", "terms", "update")
to your NAMESPACE file.
crrstep : crr.makecov1: no visible global function definition for
  'model.matrix'
crrstep : crr.dropterm: no visible global function definition for
  'terms'
crrstep : crr.dropterm: no visible global function definition for
  'as.formula'
crrstep : crr.addterm: no visible global function definition for
  'terms'
crrstep : crr.addterm: no visible global function definition for
  'as.formula'
crrstep: no visible global function definition for 'as.formula'
crrstep: no visible global function definition for 'terms'
crrstep: no visible global function definition for 'model.frame'
crrstep: no visible binding for global variable 'na.pass'
crrstep: no visible global function definition for 'update'
crrstep: no visible global function definition for 'drop.terms'
Undefined global functions or variables:
  as.formula drop.terms model.frame model.matrix na.pass terms update
Consider adding
  importFrom("stats", "as.formula", "drop.terms", "model.frame",
             "model.matrix", "na.pass", "terms", "update")
to your NAMESPACE file.
crrstep : crr.makecov1: no visible global function definition for
  ‘model.matrix’
crrstep : crr.dropterm: no visible global function definition for
  ‘terms’
crrstep : crr.dropterm: no visible global function definition for
  ‘as.formula’
crrstep : crr.addterm: no visible global function definition for
  ‘terms’
crrstep : crr.addterm: no visible global function definition for
  ‘as.formula’
crrstep: no visible global function definition for ‘as.formula’
crrstep: no visible global function definition for ‘terms’
crrstep: no visible global function definition for ‘model.frame’
crrstep: no visible binding for global variable ‘na.pass’
crrstep: no visible global function definition for ‘update’
crrstep: no visible global function definition for ‘drop.terms’
Undefined global functions or variables:
  as.formula drop.terms model.frame model.matrix na.pass terms update
Consider adding
  importFrom("stats", "as.formula", "drop.terms", "model.frame",
             "model.matrix", "na.pass", "terms", "update")
to your NAMESPACE file.
crrstep : crr.makecov1: no visible global function definition for
  ‘model.matrix’
crrstep : crr.dropterm: no visible global function definition for
  ‘terms’
crrstep : crr.dropterm: no visible global function definition for
  ‘as.formula’
crrstep : crr.addterm: no visible global function definition for
  ‘terms’
crrstep : crr.addterm: no visible global function definition for
  ‘as.formula’
crrstep: no visible global function definition for ‘as.formula’
crrstep: no visible global function definition for ‘terms’
crrstep: no visible global function definition for ‘model.frame’
crrstep: no visible binding for global variable ‘na.pass’
crrstep: no visible global function definition for ‘update’
crrstep: no visible global function definition for ‘drop.terms’
Undefined global functions or variables:
  as.formula drop.terms model.frame model.matrix na.pass terms update
Consider adding
  importFrom("stats", "as.formula", "drop.terms", "model.frame",
             "model.matrix", "na.pass", "terms", "update")
to your NAMESPACE file.
crrstep : crr.makecov1: no visible global function definition for
  ‘model.matrix’
crrstep : crr.dropterm: no visible global function definition for
  ‘terms’
crrstep : crr.dropterm: no visible global function definition for
  ‘as.formula’
crrstep : crr.addterm: no visible global function definition for
  ‘terms’
crrstep : crr.addterm: no visible global function definition for
  ‘as.formula’
crrstep: no visible global function definition for ‘as.formula’
crrstep: no visible global function definition for ‘terms’
crrstep: no visible global function definition for ‘model.frame’
crrstep: no visible binding for global variable ‘na.pass’
crrstep: no visible global function definition for ‘update’
crrstep: no visible global function definition for ‘drop.terms’
Undefined global functions or variables:
  as.formula drop.terms model.frame model.matrix na.pass terms update
Consider adding
  importFrom("stats", "as.formula", "drop.terms", "model.frame",
             "model.matrix", "na.pass", "terms", "update")
to your NAMESPACE file.
crrstep : crr.makecov1: no visible global function definition for
  ‘model.matrix’
crrstep : crr.dropterm: no visible global function definition for
  ‘terms’
crrstep : crr.dropterm: no visible global function definition for
  ‘as.formula’
crrstep : crr.addterm: no visible global function definition for
  ‘terms’
crrstep : crr.addterm: no visible global function definition for
  ‘as.formula’
crrstep: no visible global function definition for ‘as.formula’
crrstep: no visible global function definition for ‘terms’
crrstep: no visible global function definition for ‘model.frame’
crrstep: no visible binding for global variable ‘na.pass’
crrstep: no visible global function definition for ‘update’
crrstep: no visible global function definition for ‘drop.terms’
Undefined global functions or variables:
  as.formula drop.terms model.frame model.matrix na.pass terms update
Consider adding
  importFrom("stats", "as.formula", "drop.terms", "model.frame",
             "model.matrix", "na.pass", "terms", "update")
to your NAMESPACE file.
crrstep : crr.makecov1: no visible global function definition for
  'model.matrix'
crrstep : crr.dropterm: no visible global function definition for
  'terms'
crrstep : crr.dropterm: no visible global function definition for
  'as.formula'
crrstep : crr.addterm: no visible global function definition for
  'terms'
crrstep : crr.addterm: no visible global function definition for
  'as.formula'
crrstep: no visible global function definition for 'as.formula'
crrstep: no visible global function definition for 'terms'
crrstep: no visible global function definition for 'model.frame'
crrstep: no visible binding for global variable 'na.pass'
crrstep: no visible global function definition for 'update'
crrstep: no visible global function definition for 'drop.terms'
Undefined global functions or variables:
  as.formula drop.terms model.frame model.matrix na.pass terms update
Consider adding
  importFrom("stats", "as.formula", "drop.terms", "model.frame",
             "model.matrix", "na.pass", "terms", "update")
to your NAMESPACE file.
crrstep : crr.makecov1: no visible global function definition for
  ‘model.matrix’
crrstep : crr.dropterm: no visible global function definition for
  ‘terms’
crrstep : crr.dropterm: no visible global function definition for
  ‘as.formula’
crrstep : crr.addterm: no visible global function definition for
  ‘terms’
crrstep : crr.addterm: no visible global function definition for
  ‘as.formula’
crrstep: no visible global function definition for ‘as.formula’
crrstep: no visible global function definition for ‘terms’
crrstep: no visible global function definition for ‘model.frame’
crrstep: no visible binding for global variable ‘na.pass’
crrstep: no visible global function definition for ‘update’
crrstep: no visible global function definition for ‘drop.terms’
Undefined global functions or variables:
  as.formula drop.terms model.frame model.matrix na.pass terms update
Consider adding
  importFrom("stats", "as.formula", "drop.terms", "model.frame",
             "model.matrix", "na.pass", "terms", "update")
to your NAMESPACE file.
crrstep : crr.makecov1: no visible global function definition for
  ‘model.matrix’
crrstep : crr.dropterm: no visible global function definition for
  ‘terms’
crrstep : crr.dropterm: no visible global function definition for
  ‘as.formula’
crrstep : crr.addterm: no visible global function definition for
  ‘terms’
crrstep : crr.addterm: no visible global function definition for
  ‘as.formula’
crrstep: no visible global function definition for ‘as.formula’
crrstep: no visible global function definition for ‘terms’
crrstep: no visible global function definition for ‘model.frame’
crrstep: no visible binding for global variable ‘na.pass’
crrstep: no visible global function definition for ‘update’
crrstep: no visible global function definition for ‘drop.terms’
Undefined global functions or variables:
  as.formula drop.terms model.frame model.matrix na.pass terms update
Consider adding
  importFrom("stats", "as.formula", "drop.terms", "model.frame",
             "model.matrix", "na.pass", "terms", "update")
to your NAMESPACE file.
crrstep : crr.makecov1: no visible global function definition for
  'model.matrix'
crrstep : crr.dropterm: no visible global function definition for
  'terms'
crrstep : crr.dropterm: no visible global function definition for
  'as.formula'
crrstep : crr.addterm: no visible global function definition for
  'terms'
crrstep : crr.addterm: no visible global function definition for
  'as.formula'
crrstep: no visible global function definition for 'as.formula'
crrstep: no visible global function definition for 'terms'
crrstep: no visible global function definition for 'model.frame'
crrstep: no visible binding for global variable 'na.pass'
crrstep: no visible global function definition for 'update'
crrstep: no visible global function definition for 'drop.terms'
Undefined global functions or variables:
  as.formula drop.terms model.frame model.matrix na.pass terms update
Consider adding
  importFrom("stats", "as.formula", "drop.terms", "model.frame",
             "model.matrix", "na.pass", "terms", "update")
to your NAMESPACE file.